C Programming Tutorial - 53 - Random File Access

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

int main()
{
    // before we could open a file and ONLY read it or ONLY write it
    // what if we want to change one users name? Don't want to write entire file over
    FILE * fPointer;

    // w+ open new file for writing first then reading
    fPointer = fopen("bacon.txt", "w+");
    fputs("I ate 3 pumpkins today", fPointer);

    // SEEK_SET means start at the beginning of the file
    fseek(fPointer, 7, SEEK_SET);
    fputs(" munchkins on Friday", fPointer);

    // SEEK_END means from the end of the file
    fseek(fPointer, -6, SEEK_END);
    fputs("top of a mountain", fPointer);

    fclose(fPointer);

    return 0;
}