(八)C++篇-main函数参数传递

1，main函数参数传递，测试代码如下：

#include <iostream>
using namespace std;

int main(int argc, char **argv)
{
    //check the count of argument
    if(argc !=3)
    {
        cout<< "you should use three argument!"<<endl;
        return -1;
    }
    
    cout<<"Summation of "<<argv[1]<< " and " << argv[2] << " is " << (atof(argv[1])+atof(argv[2])) <<endl;
    return 0;
}

输出结果：

tekken@tekken:~/C++WS$ ./a.out 5 6
Summation of 5 and 6 is 11
tekken@tekken:~/C++WS$ ./a.out
you should use three argument!

2，输出传递给main的实参的值，测试代码如下：

#include <iostream>
using namespace std;

int main(int argc,char **argv)
{
    cout << "argument passed to main():"<<endl;
    for(int i = 0;i!= argc;++i)
    {
        cout<<argv[i]<<endl;
    }
    return 0;
}

输出结果：

tekken@tekken:~/C++WS$ ./a.out 5 6
argument passed to main():
./a.out
5
6