"invalid conversion from string to an integer"

[IWishIKnew]

Here is my delima:

while(((menu_choice > f_lines) && (menu_choice < 1)) || (menu_choice == 0))
{
    cin>> menu_choice;
}

This piece of code I wrote for a program gets a number between the values specified (no greater than the number of options there are, and no less than 0). I used cin>> because getline() is not needed in this scenario, we want numbers not a string. But, what happens when we enter a string anyway? I'll tell you: The dam thing doesn't know what to do with it. So my question is:

Since we can't add a string argument to pervent the entering of a string (integers can't be strings) into the command line, what can we do to squeez this bug out of my program?

[histrungalot]

Try something like this

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#include <iostream> #include <string> #include <sstream> using namespace std; int main() { string s; int menu_choice(0),f_lines(10); cout << "Enter selection: "; getline(cin,s); stringstream iStr(s); while( !(iStr >> menu_choice) || menu_choice > f_lines || menu_choice < 1 ) { iStr.clear(); cout << "Error! Re-enter selection: "; getline(cin,s); iStr.str(s); } cout << "Menu Choice: " << menu_choice << endl; return 0; }

./a.out Enter selection: 400 Error! Re-enter selection: dog Error! Re-enter selection: 4 Menu Choice: 4