Can anyone help fix this?

Untamedlemon

*FORGOT TO MENTION IN TITLE THAT THIS IS C++*

I'm working on a small project at the moment which involves a random sum being generated, Its only addition at the moment but that would be easy to expand. It works fine, typing in the right answer tells you that you are correct while typing in the wrong answer tells you that you are incorrect and displays the correct answer but say you type in 'sdfldhfs' it tells you that that you are correct even though i have set it to say 'that is not a number'.
I suspect i'm doing something fairly basic in the wrong way.
If anyone could help me with this it would be great, its been annoying for the last few days!

L.Jenkins

I hate to do your work for you, but try this out.

// Don't need as many libraries
#include <string.h>
#include <cstdlib>

using namespace std;

int main()
{
int a = 0, b = 0, sum = 0, x = 0;

while(true) // Keeps going until you get a right answer
{
a = 1 + (rand() % 10);
b = 1 + (rand() % 10);
sum = a + b;

cout << "Take a guess: \n";
cin >> x; // Takes in a type int as x is defined as an int

if(x != sum)
{
cout << "Wrong Answer!\n";
}
if(cin.fail()) // Checks if input for a valid type
{
cout << "Can not enter a string!\n";
system("pause"); // If you want to keep going remove these to lines.
break;
}
if(x == sum)
{
cout << "Correct\n";
}
}
return 0;
}

The problem is with isalpha(num). It only checks for a character and it is a string you need to check for and cin.fail() does this. You can also change the while with a for loop. Remove the break from the code if you don't want the program to stop.

Untamedlemon

Thank you very much, that worked perfectly. Glad to have that problem sorted!
Thanks.

L.Jenkins

The main issue is, do you understand it?

Untamedlemon

Yes I understand it now,
Thank you for your help.

L.Jenkins

Good glad I could help.