How to pass data read in a program in c++ as momando in cmd

Question

I would like to know how to read something in a program and pass this reading as a command to cmd, through stdlib or cstdlib library, whatever.
The picture shows what I’m trying to do.

Answer 1

#include <iostream>
#include <string>

using std::string;
using std::system;

int main()
{
    string line;
    string command = "ping ";
    string param = "www.google.com";

    line = command + param;

    system(line.c_str());
    return 0;
}

Alternatively, you may concatenate one std::string and call .c_str() directly without a third temporary variable. Second [class.Temporary]/4, the lifetime of the temporary created by concatenation goes to the end of the function call, so it is safe to get a pointer to the first element of the string with .c_str().

using std::string;

int main()
{
    string arg = "www.google.com";
    system(("ping " + arg).c_str());
    return 0;
}