a + b + c 求和

#include <iostream>
int main()
{
    std::cout << "请输入三个数字,以空格分隔，按回车键结束：" << std::endl;
    int a = 0, b = 0, c = 0;
    std::cin >> a >> b >> c; 
    std::cout << a << " + " << b << " + " << c 
    << " = "<< a + b + c << std::endl;
    return 0;
}