1.3-4
以下程序从键盘输入boy，其输出结果是(    )
#include
main() {
       char ch1, ch2, ch3;
       ch1 = getchar();
       ch2 = getchar();
       ch3 = getchar();
       ch1 = ch1 - 32;
       ch2 = ch2 - 32;
       ch3 = ch3 - 32;
       printf("%c%c%c", ch1, ch2, ch3);
}