C/C++_不使用*和+運算子完成乘法

How do you want to get the result of multiplication by 15 without using * (multiply operation) and + (plus operations).

解答：
#include
#include

int main()
{
int a = 2;
printf("%d\n" , (a << 4) - a);　　　//相當於a * 2⁴ - a

system("PAUSE");
return 0;
}