如果printf()缺少参数怎么办？

#include <stdio.h>
int main(void)
{
    int ten = 10;
    int two = 2;// 

    printf(Doing it right: );
    printf(%d minus %d is %d\n, ten, 2, ten - two );
    printf(Doing it wrong: );
    printf(%d minus %d is %d\n, ten );  // forgot 2 arguments

    return 0;
}