생활을 담고 싶다~나는 두장님~

getchar()

getch()

getc(화일 포인터)

putchar()

putch()

putc(문자, 화일 포인터)

 [예제 11-1] putchar() 함수 사용 방법

 #include <stdio.h>

void main()

     {

         char ch;

         while((ch = getchar()) != '\r')

         putchar(ch);

     }

 TurboC example

TurboC example

[예제 11-2] putch() 함수 사용 방법  

#include <stdio.h>

void main()

    {

        char ch;

        while((ch = getch()) != '\r')

        putch(ch);

    }

TurboC example 

[예제 11-3] getc(), putc() 함수 사용 방법  

 #include <stdio.h>

void main()

     {

          char ch;

          while((ch = getc(stdin)) != '\r')

          putc(ch,stdout);

     }

TurboC example

TurboC example 

gets(문자열)

puts(문자열)

[예제 11-4]  

#include <stdio.h>

void main()

     {

          char string[80];

          printf("Input a string:");

          gets(string);

          puts(string);

     }  

Input a string:This is sample string

This is sample string 

이 름

장 치

모 드

stdin

stdout

stderr

stdaux

stdprn

표준 입력 장치(키보드)

표준 출력 장치(화면)

표준 에러 장치(화면)

표준 보조 장치(직렬 포트)

표준 출력 장치(병렬 프린터)

텍스트 모드

텍스트 모드

텍스트 모드

2 진 모드

2 진 모드

분 류

접근 모드

접근 내용

읽 기

r

읽기 전용으로 기존의 화일을 개방

쓰 기

w

a

쓰기 전용으로 새로운 화일을 생성

추가로 쓰기 위해 화일을 개방

갱 신

r+

w+

a+

갱신을 위해 기존의 화일을 개방

갱신을 위해 새로운 화일을 생성

갱신을 위해 화일의 끝에 개방

2진 모드

"rb", "wb", "ab"

"r+b" 또는 "rb+"

"r+a" 또는 "ra+"

2진 화일에 대해 r,w,a 기능 수행

2진 화일에 대해 r+ 기능 수행

2진 화일에 대해 a+ 기능 수행

[예제 11-5] fputc() 함수를 이용하여 화일에 출력하는 프로그램  

 #include <stdio.h>

void main()

     {

          FILE *fp;

          char ch;

          fp=fopen("kim.dat","w");

          while((ch=getch()) != '\r') {

               putch(ch);

               fputc(ch,fp);

          }

          fclose(fp);

     }

"kim.dat"화일에는 키보드를 통해서 입력된 문자가 저장된다. 

[예제 11-6] fgetc() 함수를 이용하여 화일에 있는 내용을 화면에 출력하는 프로그램  

#include <stdio.h>

void main(void)

     {

          FILE *fp;

          char string[] = "This is a test";

          char ch;

          if((fp=fopen("kim.dat", "r")) == NULL) {

               printf("\n File not found");

               exit(-1);

          }

          do

          {

               ch = fgetc(fp);

               putch(ch);

          } while (ch != EOF);

          fclose(fp);

     }

"kim.dat" 화일에 있는 내용이 화면에 출력된다.

만약 "kim.dat"라는 화일이 없으면

"File not found" 라는 메시지가 출력된다.

[예제 11-7] fgets(), fputs() 함수 사용 방법  

#include <stdio.h>

void main()

     {

          FILE *fp,*fp1;

          char string[30];

          fp=fopen("kim1.dat","w");

          fp1=fopen("kim.dat","r");

          while(fgets(string,30,fp1) != NULL)

          fputs(string,fp);

          fclose(fp);

          fclose(fp1);

}

c:>type kim.dat

Jim Botton, sportscaster and author of Ball Four, on

the reception to his book : "Pete rose would screen at

me from dugout because I resealed too much. Now he's

posing in magazine ads in his underwear.

[예제 11-8] 성적을 저장하는 프로그램  

#include <stdio.h>

void main()

     {

          FILE *fp;

          char name[20];

          int number;

          int kor;

          int eng;

          int math;

          int total;

          int i=0;

          fp=fopen("grade.dat","w");

          do {

               printf("Enter name, number, Kor, Eng, Math : ");

               scanf("%s %d %d %d %d",name, &number, &kor, &eng,                          &math);

               total=kor+eng+math;

               fprintf(fp,"\n%s %d %d %d %d %d",name, number, kor, eng,

                         math, total);

               i++;

          } while(i <4);

          fclose(fp);

     }

Enter name, number, Kor, Eng, Math : kim 1 57 87 45

Enter name, number, Kor, Eng, Math : kim1 2 67 45 76

Enter name, number, Kor, Eng, Math : kim2 3 76 45 95

Enter name, number, Kor, Eng, Math : kim3 4 67 45 87

c:>type grade.dat

kim 1 57 87 45 189

kim1 2 67 45 76 188

kim2 3 76 45 95 216

kim3 4 67 45 87 199 

[예제 11-9] 성적이 있는 화일을 읽어서 화면에 출력하는 프로그램  

 #include <stdio.h>

void main()

     {

          FILE *fp;

          char filename[15];

          char name[20];

          int number;

          int kor;

          int eng;

          int math;

          int total;

          printf("Enter name of a file to open foe WRITING : ");

          gets(filename);

          if((fp=fopen(filename,"r")) == NULL) {

               printf("\n File not found");

               exit(-1);

          }

          printf("\n Name Number KOR ENG MATH TOTAL");

          do {

               fscanf(fp,"%s %d %d %d %d %d",name, &number, &kor,

                         &eng, &math, \&total);

               printf("\n %-10s%3d %3d %3d %3d %3d", name, number, kor,                          eng, math,total);

          } while(!feof(fp));

          fclose(fp);

     }

Enter name of a file to open foe WRITING : grade.dat

Name Number KOR ENG MATH TOTAL

kim 1 57 87 45 189

kim1 2 67 45 76 188

kim2 3 76 45 67 216

kim3 4 67 45 87 199 

[예제 11-10] fwrite() 함수를 이용한 프로그램  

#include <stdio.h>

void main()

     {

          struct {

               char name[20];

               int number;

               float height;

          } man;

          FILE *fp;

          float dummy=0.0;

          if((fp=fopen("kim.dat","wb")) == NULL) {

               printf("\n File not found");

               exit(-1);

          }

          do {

               printf("\n Enter name : ");

               gets(man.name);

               printf(" Enter number : ");

               scanf("%d",&man.number);

               printf(" Enter height : ");

               scanf("%f",&man.height);

               fflush(stdin);

               fwrite(&man, sizeof(man),1,fp);

               printf("Add another man(y/n) ?");

          } while(getch() == 'y');

          fclose(fp);

     }

Enter name : kim1

Enter number : 1

Enter height : 34.83

Add another man(y/n) ?

Enter name : kim2

Enter number : 2

Enter height : 67.56

Add another man(y/n) ? y

Enter name : kim3

Enter number : 3

Enter height : 84.54

Add another man(y/n) ? n 

[예제 11-11] fread() 함수을 이용한프로그램  

#include <stdio.h>

#include <stdlib.h>

void main()

     {

          struct {

               char name[20];

               int number;

               float height;

          } man;

          FILE *fp;

          fp=fopen("kim.dat","rb");

          while(1) {

               fread(&man, sizeof(man), 1, fp);

               if(feof(fp)) {

                    fclose(fp);

                    exit(-1);

               }

               printf("\n Name : %s", man.name);

               printf("\n Numer : %d", man.number);

               printf("\n Height : %4.2f",man.height);

           };

     }

Name : kim1

Number : 1

height : 34.83

Name : kim2

Number :2

height : 67.56

Name : kim3

Number : 3

height : 84.54  

상 수

실 제 값

의 미

SEEK_SET

SEEK_CUR

SEEK_END

0

1

2

화일의 처음

현재 화일 포인터의 위치

화일끝 검출 위치

함수명

기 능

fflush

fgetpos

fsetpos

ftell

rewind

버퍼에 넣으려는 전체의 문자를 화일에 씀

화일 위치의 정보를 읽음

화일 포인터의 위치 설정

현제의 화일 위치 파악

화일의 위치를 선두로 이동

[예제 11-12] fseek() 함수를 사용한 프로그램  

#include <stdio.h>

#include <stdlib.h>

void main()

     {

          struct {

               char name[20];

               int number;

               float height;

          } man;

          FILE *fp;

          int rec_no;

          long int offset;

          fp=fopen("kim.dat","rb");

          printf("Enter record number : ");

          scanf("%d",&rec_no);

          offset=(rec_no-1) * sizeof(man);

          if(fseek(fp,offset,SEEK_SET)) {

               printf("\n Can't move pointer there.");

               exit(-1);

          }

          fread(&man, sizeof(man), 1, fp);

          printf("\n Name : %s", man.name);

          printf("\n Numer : %d", man.number);

          printf("\n height : %f",man.height);

          fclose(fp);

      }

Enter record number : 2

Name : kim2

Numer : 2

height : 67.55998 

[예제 11-12] malloc() 함수를 이용한 프로그램  

#include <string.h>

#include <stdio.h>

void main()

     {

          char temp_string;

          temp_string=(cahr *) malloc(100);

          strcpy(temp_string,"Hello Kang");

          printf("Enter string : ");

          fgets(temp_string,100,stdin);

          printf("Your input string is %s",temp_string);

     }

Hello Kang

Enter string : Good morning !

Your input string is Good morning !

함 수 명

형 식

의 미

getc(fp)

getc(fp)

FILE *fp;

fp가 가르키는 화일로부터 한 문자 입력

putc(c,fp)

putc(c,fp)

int c;

FILE *fp;

fp가 가르키는 화일로 한 문자 출력

fgetc(fp)

fgetc(c)

int c;

fp가 가르키는 화일로부터 한 문자 입력

fputc(c,fp)

fputc(c,fp)

int c;

FILE *fp;

fp가 가르키는 화일로 한 문자 출력

fgtes(s,n,fp)

fgtes(s,n,fp)

char *s;

int n;

FILE *fp;

화일 fp에 최대 n바이트의 문자열 s를 입력

fputs(s,fp)

fputs(s,fp)

char *s;

FILE *fp;

화일 fp에 문자열 s를 출력

fprintf(fp,format,인수)

fprints(fp,format,인수)

FILE *fp;

char *format;

화일 fp에 지정된 형태 format에 따라 출력

fscanf(fp,format,인수)

fscanf(fp,format,인수)

FILE *fp;

char *format;

화일 fp에서 지정된 형태 format에 따라 입력

fread(s,n,item,fp)

fread(s,n,item,fp)

char *s;

int n;

int item;

FILE *fp;

화일 fp에서 지정된 갯수 만큼의 데이타를 읽어 문자 열 s에 입력

[문제 11-1] 화일을 읽어서 대문자는 소문자로 소문자는 대문자로 변환하는 프로그램  

#include <stdio.h>

void main()

     {

          int ch;

          FILE *fp, *fp;

          char filename1[13], filename2[13];

          printf("\n Input filename : ");

          gets(filename1);

          fp=fopen(filename1,"r");

          printf(" Output filename : ");

          gets(filename2);

          fp1=fopen(filename2,"w");

          while((ch=fgetc(fp)) != EOF) {

               if(ch >= 'A' &&ch <='Z')

                    fputc(ch + 32, fp1);

               else if(ch >= 'a' &&ch <='z')

                    fputc(ch-32,fp1);

               else

                    fputc(ch,fp1);

          }

     }

Input filename : in_letter.dat

Output filename : out_letter.dat

c:>type in_letter.dat

Jim Botton, sportscaster and author of Ball Four, on

the reception to his book : "Pete rose would screan at

me from dugout because I recealed too much. Now he's

posing in magazine ads in his underwear.

c:>type out_letter.dat

jIM bOTTON, SPORTSCASTER AND AUTHOR OF bALL fOUR, ON

THE RECEPTION TO HIS BOOK : "pETE ROSE WOULD SCREAN AT

ME FROM DUGOUT BECAUSE i RECEALED TOO MUCH. nOW HE'S

POSING IN MAGAZINE ADS IN HIS UNDERWEAR.

[학습 11-1]  

#include <stdio.h>

void main()

     {

          int ch;

          int i=0;

          char string[100];

          printf("\n Input string : ");

          gets(string);

          do {

               ch=string[i];

               if(ch >= 'A' &&ch <='Z')

                    putchar(ch + 32);

               else if(ch >= 'a' &&ch <='z')

                    putchar(ch-32);

               else

                    putchar(ch);

               i++;

           } while(string[i] != '\0');

     }

Input String : This is Sample Text

tHIS IS sAMPLE tEXT  

[문제 11-2] 레코드 단위 입·출력 함수를 이용하여 봉급을 계산하는 프로그램  

#include <stdio.h>

#include <string.h>

struct{

     char depart[4];

     char name[20];

     int day;

     float pay;

}work_pay;

void main()

     {

          char numstr[20], flag;

          float money=30000;

          FILE *fp;

          if((fp=fopen("work_pay.rec","ab"))==NULL)

          fp=fopen("work_pay.rec","wb");

          do{

               printf("\nEnter department : ");

               gets(work_pay.depart);

               printf("Enter name : ");

               gets(work_pay.name);

               printf("Enter How much day : ");

               gets(numstr);

               work_pay.day=atoi(numstr);

               work_pay.pay=money * (float)work_pay.day;

               printf("\nPayment per day : %f",money);

               printf("\nTotal Payment:%f",work_pay.pay);

               fwrite(&work_pay,sizeof(work_pay),1,fp);

               printf("\n\nContinue (Y/N)...");

               flag=getche();

          }while(flag != 'N' &&flag != 'n');

          fclose(fp);

     }

Enter department : 3

Enter name : Kang jae sik

Enter how much day : 34

Payment per day : 30000.00000

Total Payment : 1020000.00000

Continue (Y/N)...

결과는 "work_pay.rec"라는 화일에 2진 정보로 저장된다.

[문제 11-3] 화일에 있는 문자의 수를 출력  

 #include <stdio.h>

#include <string.h>

void main(int argc, char *argv[])

     {

          FILE *fp;

          char string[81];

          char filename[13];

          int count=0;

          strcpy(filename,argv[1]);

          if(argc != 2) {

               printf("\n Input filename : ");

               gets(filename);

          }

          if((fp=fopen(filename,"r")) == NULL) {

               printf("\n File not found");

               exit(-1);

          }

          while(getc(fp) != EOF)

          count++;

          printf("\n File <%s >contains %d characters",filename,count);

          fclose(fp);

     }

 Input file name : exam.dat

File <exam.dat >contains 444 characters

[문제 11-4] 임의의 화일을 읽어서 행을 두 배로 확장하는 프로그램  

#include <stdio.h>

#include <string.h>

void main(int argc, char *argv[])

     {

          FILE *in_fp, *out_fp;

          char in_filename[13], out_filename[13];

          strcpy(in_filename,argv[1]);

          strcpy(out_filename,argv[2]);

          if(argc <3) {

               printf("\n Input filename : ");

               gets(in_filename);

               printf(" Output filename : ");

               gets(out_filename);

          }

          in_fp=fopen(in_filename,"r");

          out_fp=fopen(out_filename,"w");

          double_space(in_fp, out_fp);

          fclose(in_fp);

          fclose(out_fp);

     }

double_space(in_p, out_p)

FILE *in_p, *out_p;

     {

          int c;

          while((c=getc(in_p)) != EOF) {

               putc(c,out_p);

               if(c == '\n')

                    putc('\n',out_p);

          }

     }

 Input filename : in.dat

Output filename : out.dat

c:>type in.dat

This is

a

sample

file

c:>type out.dat

This is

a

sample

file 

[학습 11-2] 화일의 개행문자를 무시하여 화일의 내용을 한 줄로 길게 늘리는 프로그램  

#include <stdio.h>

#include <string.h>

void main(int argc, char *argv[])

     {

          FILE *in_fp, *out_fp;

          char in_filename[13], out_filename[13];

          strcpy(in_filename,argv[1]);

          strcpy(out_filename,argv[2]);

          if(argc <3) {

               printf("\n Input filename : ");

               gets(in_filename);

               printf(" Output filename : ");

               gets(out_filename);

          }

          in_fp=fopen(in_filename,"r");

          out_fp=fopen(out_filename,"w");

          double_space(in_fp, out_fp);

          fclose(in_fp);

          fclose(out_fp);

     }

double_space(in_p, out_p)

FILE *in_p, *out_p;

     {

          int c;

          while((c=getc(in_p)) != EOF) {

               if(c == '\n')

                    putc(' ',out_p);

               else

                    putc(c,out_p);

          }

     }

Input filename : in.dat

Output filename : out.dat

c:>type in.dat

This is

a

sample

file

c:>type out.dat

This is a sample file  

[문제 11-5] 화일에 'A'부터 'Z'까지의 문자를 저장하고 해당 위치에 있는 문자를 출력  

 #include <stdio.h>

void main()

     {

          FILE *fp;

          int ch;

          int num;

          char filename[13];

          printf("\n Input file name : ");

          gets(filename);

          fp=fopen(filename,"w");

          for(ch='A'; ch<='Z'; ch++)

          putc(ch, fp);

          fclose(fp);

          if((fp=fopen(filename,"r")) == NULL) {

               printf("\n File not found");

               exit(-1);

          }

          printf(" Record Number = ");

          scanf("%d",&num);

          if(fseek(fp,num-1,0) != 0) {

               perror("Can't move pointer there.");

               exit(-1);

          }

          ch=getc(fp);

          printf("\n Record Number : %d character = %c",num,ch);

          fclose(fp);

     }

 Input file name : in.dat

Record number : 5

Record number : 5 character = e

c:>type in.dat

ABCDEFGHIJKLMNOPQRSTUVWXYZ

[문제 11-6] 화일을 복사하는 프로그램  

#include <stdio.h>

#include <string.h>

void main(int argc, char *argv[])

     {

          FILE *in_fp, *out_fp;

          char in_filename[13], out_filename[13];

          char ch;

          strcpy(in_filename, argv[1]);

          strcpy(out_filename, argv[2]);

          if(argc <3) {

               printf("\n Input file name : ");

               gets(in_filename);

               printf(" Output file name : ");

               gets(out_filename);

          }

          if((in_fp=fopen(in_filename,"r")) == NULL) {

               printf("\n %s file not found");

               exit(-1);

          }

          out_fp=fopen(out_filename,"w");

          while((ch=getc(in_fp)) != EOF)

          putc(ch, out_fp);

          fclose(in_fp);

          fclose(out_fp);

     }

Input file name : letter.dat

Output file name : letter.bak

c:>type letter.dat

Jim Botton, sportscaster and author of Ball Four, on

the reception to his book : "Pete rose would screan at

me from dugout because I recealed too much. Now he's

posing in magazine ads in his underwear.

c:>type letter.bak

Jim Botton, sportscaster and author of Ball Four, on

the reception to his book : "Pete rose would screan at

me from dugout because I recealed too much. Now he's

posing in magazine ads in his underwear.

[학습 11-3] 두 개의 화일을 합병하는 프로그램  

 #include <stdio.h>

#include <string.h>

#define MAX_LINE 80

void main(int argc, char *argv[])

     {

          FILE *in_fp[2], *out_fp;

          int i;

          char ch;

          char temp[MAX_LINE];

          char *in_filename[2],

          out_filename[13];

          strcpy(in_filename[0],argv[1]);

          strcpy(in_filename[1],argv[2]);

          if(argc <3) {

               for(i=0; i<2; i++) {

                    printf("Input %d-st file name : ",i+1);

                    scanf("%s",in_filename[i]);

               }

          }

          for(i=0; i<=1; i++)

          if((in_fp[i]=fopen(in_filename[i],"r")) == NULL) {

               printf("\n %s file not found",in_filename[i]);

               exit(-1);

          }

          printf("\nMerge file name : ");

          scanf("%s",out_filename);

          out_fp=fopen(out_filename,"w");

          for(i=0; i<2; i++) {

               while((ch=getc(in_fp[i])) != EOF)

               putc(ch,out_fp);

          }

          fclose(in_fp[0]);

          fclose(in_fp[1]);

          fclose(out_fp);

     }

Input 1-st file name : in1.dat

Input 2-st file nsme : in2.dat

Merge file name : out.dat

c:>type in1.dat

Jim Botton, sportscaster and author of Ball Four, on

the reception to his book : "Pete rose would screan at

c:>type in2.dat

me from dugout because I recealed too much. Now he's

posing in magazine ads in his underwear.

c:>type out.dat

Jim Botton, sportscaster and author of Ball Four, on

the reception to his book : "Pete rose would screan at

me from dugout because I recealed too much. Now he's

posing in magazine ads in his underwear. 

[문제 11-7] 화일을 dump하는 프로그램  

#include <stdio.h>

#include <string.h>

void main(int argc, char *argv[])

     {

          FILE *fp;

          int i;

          char ch;

          char buffer[17];

          char filename[13];

          strcpy(filename,argv[1]);

          if(argc <2) {

               printf("\nInput file name : ");

               scanf("%s",filename);

          }

          if((fp=fopen(filename,"r")) == NULL) {

               printf("\n %d file not found",filename);

               exit(-1);

          }

          do {

               for(i=0; i<16; i++) {

                    ch=getc(fp);

                    if(ch == EOF)

                         exit(1);

                    if(ch <31)

                         ch='.';

                    buffer[i]=ch;

                    printf("%3X",ch);

               }

               buffer[i]='\0';

               printf(" %s",buffer);

               putchar('\n');

          } while(1);

          fclose(fp);

     }

Input file name : letter.dat

20 20 20 4A 69 6D 20 42 6F 74 74 6F 6E 2C 20 73 Jim Botton, s

70 6F 72 74 73 63 61 73 74 65 72 20 61 6E 64 20 portscaster and

61 75 74 68 6F 72 20 6F 66 20 42 61 6C 6C 20 46 author of Ball F

6F 75 72 2C 20 6F 6E 2E 20 74 68 65 20 72 65 63 our, on. the rec

65 70 74 69 6F 6E 20 74 6F 20 68 69 73 20 62 6F eption to his bo

6F 6B 20 3A 20 22 50 65 74 65 20 72 6F 73 65 20 ok : "Pete rose

77 6F 75 6C 64 20 73 63 72 65 61 6E 20 61 74 2E would screan at.

20 6D 65 20 66 72 6F 6D 20 64 75 67 6F 75 74 20 me from dugout

62 65 63 61 75 73 65 20 20 49 20 72 65 63 65 61 because I recea

6C 65 64 20 74 6F 6F 20 6D 75 63 68 2E 20 4E 6F led too much. No

77 20 68 65 27 73 2E 20 70 6F 73 69 6E 67 20 69 w he's. posing i

6E 20 6D 61 67 61 7A 69 6E 65 20 61 64 73 20 69 n magazine ads i

6E 20 68 69 73 20 75 6E 64 65 72 77 65 61 72 2E n his underwear.

2E 2E  

[문제 11-8] sin함수를 화일에 출력하는 프로그램  

#include <stdio.h>

#include <math.h>

void main()

     {

          FILE *fp;

          char filename[13];

          int num,i;

          float x;

          printf("\nOutput file name : ");

          scanf("%s",filename);

          fp=fopen(filename,"w");

          num=16;

          fprintf(fp,"%d",num);

          for(i=0; i<num; i++) {

               x=sin(2*M_PI/num*i);

               fprintf(fp,"\n%f",x);

          }

     }

Output file name : sin.dat

16

0.000000

0.382683

0.707107

0.923880

1.000000

0.923880

0.707107

0.382683

0.000000

-0.382683

-0.707107

-0.923880

-1.000000

-0.923880

-0.707107

-0.382683  

[학습 11-4] 위에서 구한 화일을 그래프 형식으로 출력하기  

 #include <stdio.h>

#include <math.h>

#define MAX 100

void main()

     {

          int n;

          float x[MAX];

          file_io(&n,x);

          disp(n,x);

          sgraph(n,x);

     }

disp(int num,float array[])

     {

          int i;

          for(i=0; i<num; i++)

          printf("%d\t%f\n",i,array[i]);

     }

sgraph(int num, float array[])

     {

          int i,j,k=39;

          float fmax=0;

          for(i=0; i<num; i++) {

               if(fabs(array[i]>fmax))

               fmax=fabs(array[i]);

          }

          for(i=0; i<num; i++)

               array[i]/=fmax;

          printf("-1");string(k-2,' ');

          printf("0");string(k-2,' ');

          printf("+1\n");printf("+"); string(k-1,'-');

          printf("+"); string(k-1,'-');

          printf("+\n");

          for(i=0; i<num; i++) {

               j=array[i]*k + 0.5 + k;

               if(j>k) {string(k,' ');printf("+");

               string(j-k-1,'-');printf("*\n");

          }

          if(k==j) {

               string(k,' ');

               printf("*\n");

          }

          if(j<k) {

               string(j,' ');printf("*");

               string(k-j-1,'-');printf("+\n");

          }

     }

string(int x,char y)

     {

          if(x >0)

          while(x--)

          putchar(y);

     }

file_io(int *num,float array[])

     {

          FILE *fp;

          int i;

          char filename[13];

          printf("\nInput file name : ");

          scanf("%s",filename);

          if((fp=fopen(filename,"r")) == NULL) {

               printf("\n %s file not found",filename);

               exit(-1);

          }

          fscanf(fp,"%d",num);

          for(i=0; i<*num; i++)

          fscanf(fp,"%f",&array[i]);

     }

 Input file name : sin.dat

00.000000

10.382683

20.707107

30.923880

41.000000

50.923880

60.707107

70.382683

80.000000

9-0.382683

10-0.707107

11-0.923880

12-1.000000

13-0.923880

14-0.707107

15-0.382683

-1 0

+1

+--------------------------------------+--------------------------------------+

*

+--------------*

+---------------------------*

+-----------------------------------*

+--------------------------------------*

+-----------------------------------*

+---------------------------*

+--------------*

*

*--------------+

*---------------------------+

*-----------------------------------+

*--------------------------------------+

*-----------------------------------+

*---------------------------+

*--------------+