The shop-assistant asked John what______.
[A] did he want[B] he wanted [C] he wants

#include＜stdio．h＞ int ast(int x，int y，int *cp，int*dp) {*cp=x+y；*dp=x-y；} main() {int a，b，c，d； a=4；b=3； ast(a，b，＆C，＆d)； printf("%d，%d\n"，c，d)； }