代码

void my_memset(char *a, char c, unsigned n) {
	n -= 4; register unsigned i = 0;
	while (i < n) {
		*(a + i) = c;
		*(a + ++ i) = c;
		*(a + ++ i) = c;
		*(a + ++ i) = c;
	}
	n += 4;
	while (i < n) a[i ++] = c;
}

评测结果