Question

How to append string to text file in C

Answer 1

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

int main(int argc, char **argv) 
{ 
    FILE *f;

    f = fopen("d:\\data.txt", "a");
    if (f == NULL)
    {
         puts("Can’t open: d:\\data.txt");
         exit(1);
    }
    fprintf(f, "The new last line\n");
    
    fclose(f);
    
    return(0);
}



/*
run:

"d:\\data.txt" content:

Programming is fun
The new last line 

*/

 

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