Is it possible to use variables in the system function?

Question

C++ / C#

For example, there is a code:

int main(void)
{
    int i = 1;
    system("echo $i")
    return 0;
}

However, echo does not treat the value of i as 1, which is what is required, but as an empty string. How, then, to pass variables to the system function?

Answer 1

Sit down and learn C++, this is not PHP for you.
Use std::to_string(i) and concatenate the string you need, or do a replacement on the original string with std::string's replace method.