Appending Files in C

To append contents to the file, you will have to open the file in append mode.

#include <stdio.h>                  

#include <string.h>

main( )

{

    FILE *f;

    char s1[25];

    int i;

    f = fopen("abc.txt","a");

    /* open for writing */

    strcpy(s1,"This is an example line.");

    for (i = 11; i <= 20; i++)

      fprintf(f,"%s Line number %d\n", s1, i);

    fclose(f); /* close the file before ending program */

}

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