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#include <stdio.h>

int main(void)
{
	FILE *	fp;
	long long unsigned int n;
	const char *	file;

	file = "file";
	n = 123456789012;

	fp = fopen(file, "w");
	if (fp) {
		fprintf(fp, "stuff %qu\n", n);	/* q stands for quad */
		fclose(fp);
	} else {
		fprintf(stderr, "Unable to open file: %s\n", file);
	}

	return 0;
}