c++ - 在 C++ 程序运行期间输入输入值 (./filename.out)

Question

我想在 C++ 程序运行期间输入用户输入，即在 ./a.out 期间插图:./a.out input1 input2

C++程序是:

两个数相加的程序

#include<iostream>
using namespace std; 
int main()
{
    int a, b;
    cin >> a >> b;
    int c = a + b;
    cout << "The sum of two numbers is : " << c << "\n";
}

现在请帮助我在运行时输入 a 和 b 的值，同时在 linux 终端中运行其输出文件。

Answer 1

对于许多简单的用途，Boost Program.Options提供了许多样板代码来处理命令行参数。来自tutorial :

// Declare the supported options.
po::options_description desc("Allowed options");
desc.add_options()
    ("help", "produce help message")
    ("compression", po::value<int>(), "set compression level")
;

po::variables_map vm;
po::store(po::parse_command_line(ac, av, desc), vm);
po::notify(vm);    

if (vm.count("help")) {
    cout << desc << "\n";
    return 1;
}

if (vm.count("compression")) {
    cout << "Compression level was set to " 
 << vm["compression"].as<int>() << ".\n";
} else {
    cout << "Compression level was not set.\n";
}