cin.ignore(numeric_limits::max(), '\n'); max() not recognize it

Question

I\'m taking an intro to C++, and I\'m using VStudio 2013 on Win7. I try to avoid the wrong data input from my menus, and it\'s working in all of them except this one.

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Answer 1

To use std::numeric_limits you'll need to include . Further, the type passed to it need to be known and actually the type std::streamsize, i.e., I would use it as

#include 
#include 
// ...
std::cin.ignore(std::numeric_limits::max(), '\n');

Also, you should probably make sure that your attempt to read something was actually successful and, if it was not, first clear() the stream's state. Here is a complete program (it certainly compiles and runs with gcc and clang):

#include 
#include 

int main()
{
    int move2, size(3);
    while (!(std::cin >> move2) || move2 < 1 || size < move2) {
        std::cin.clear();
        std::cin.ignore(std::numeric_limits::max(), '\n');
        std::cout << "invalid input ignored; please enter a valid move\n";
    }
    std::cout << "move2=" << move2 << '\n';
}