2 replies to this topic

[hbk]

How can I check in c++ if a string or character was entered in an integer field.

Exg.

Enter a number:
user enters: a

I want the program to output an error message.

[mnirahd]

Hi,

you must take the input into a character array. Then through a loop check all the characters in the array are between '0' && '9'. Try it, and let us know how does it go.

Munir

[Alexander]

You may use the ctype functions in ctype.h header to check input, a small example:

#include <iostream>
#include <ctype.h>
using namespace std;

int main ()
{
    unsigned char myinput;
    cin >> myinput;
  
    if(!isdigit(myinput)) {
        cout << "Please enter an integer.\n";
    }
    
    return 0;
}