#include <stdio.h>int main(){???????????????? ??? short int d, m, c, n;??? scanf("a = %3hd%4hd, b = %3hd%4hd", &d, &m, &c, &n);??? printf("a + b = %d", (d + c) * 10000 + m + n);??? return 0;}其中的%3hd是什么意思是啊