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

int main(int argc, char* argv[]) {
    FILE* file = fopen("abc.txt", "w");

    fputc('a', file);
    fputc('b', file);
    fputc('c', file);
    fputc('d', file);
    fputc('\n', file);
    // never write a null character to a file

    fclose(file);
    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */

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