tests/write_file.c

#include <stdio.h>
#include <string.h>

int main() {
	FILE *handle = fopen("test", "wb");
	fputs("hello from file!", handle);
	fclose(handle);
	handle = fopen("test", "r");
	char str[256] = {};
	fgets(str, 255, handle);
	printf("%s\n", str);
	return strcmp(str, "hello from file!");
}