file handling in c

 file handling using c programming:-

 example 1 :- write to a text file-

  #include<stdio.h>

  #include<conio.h>

  #include<stdlib.h>

     int main() {

  FILE *fp;

  int num;

          fp=fopen("files1.1.txt","w");

  if(fp==NULL) {

printf(" file does not exit");

exit(1);

}

printf("enter the num:");

scanf("%d",&num);

fprintf(fp,"%d",num);

printf("\n value of n is :%d",num);

fclose(fp);

return 0;

}

   

 example 2:- read to a text file-

 

   #include<stdio.h>

   #include<conio.h>

   #include<stdlib.h>

int main() {

FILE *fp;

int num;

      //if((fp=fopen("files1.1.txt","r"))=NULL)

        fp=fopen("files1.1.txt","r");

if(fp==NULL) {

printf(" file does not exit");

exit(1);

}

fscanf(fp,"%d",&num);

printf("\n value of n=%d",num);

fclose(fp);

return 0;

}

example 3:- in file wite a character-

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

 int main()

 {

 FILE *fp;

 char ch;

 fp=fopen("f1.txt","a");

  if(fp==NULL)

   {

    printf("file does not exist!!!");

    exit(1);

} 

  printf("enter the character:");

  scanf("%c",&ch);

  fprintf(fp,"%c",ch);

  printf("\n ur character is %c",ch);

 

return 0;

 }

example 4:- in file read a character-

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

 int main()

 {

 FILE *fp;

 char ch;

 fp=fopen("f1.txt","r");

  if(fp==NULL)

   {

    printf("file does not exist!!!");

    exit(1);

} 

  

  fscanf(fp,"%c",&ch);

  printf("\n ur character is: %c",ch);

 fclose(fp);

return 0;

 }

example 5:-in file read a string-

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

 int main()

 {

 FILE *fp;

 char ch[50];

 fp=fopen("f1.txt","r");

  if(fp==NULL)

   {

    printf("file does not exist!!!");

    exit(1);

} 

  

  fscanf(fp,"%s",&ch);

  printf("\n ur character is: %s",ch);

 fclose(fp);

return 0;

 }

example 6:- in file write a string-

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

 int main()

 {

 FILE *fp;

 char ch[50];

 fp=fopen("f1.txt","a");

  if(fp==NULL)

   {

    printf("file does not exist!!!");

    exit(1);

} 

  printf("enter the character:");

  gets(ch); 

               // used for read  full string also gets() allow th users to                         enter the space separated string

    fprintf(fp,"%c",ch);

 puts(ch);   

return 0;

 }