[Let us C Solution ] C Program To Writing And Reading To A Text File

Example 1: Write to a text file using fprintf()

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6. #include <stdio.h>
7. #include <stdlib.h>
9. int main()
10. {
11. int num;
12. FILE *fptr;
13. fptr = fopen("C:\\program.txt","w");
15. if(fptr == NULL)
16. {
17. printf("Error!");
18. exit(1);
19. }
21. printf("Enter num: ");
22. scanf("%d",&num);
24. fprintf(fptr,"%d",num);
25. fclose(fptr);
27. return 0;
28. }

Example 2:Read to a text file using  scanf()

#include <stdio.h>
#include <stdlib.h>

int main()
{
   int num;
   FILE *fptr;

   if ((fptr = fopen("C:\\program.txt","r")) == NULL){
       printf("Error! opening file");

       // Program exits if the file pointer returns NULL.
       exit(1);
   }

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

   printf("Value of n=%d", num);
   fclose(fptr); 
  
   return 0;
}