How come rand is not producing random numbers in my code? [duplicate]

I want to randomize variables a and b to output a random number 1 through 4 in the format of a,b. However, when I run my following code, the output is always the same no matter how many times I run it. For example, the output is always: 4,3 (same output shown 10 times.)

What did I do wrong here? Can someone point me in the right direction? Thanks!

#include <iostream>

using namespace std;

int main() 
{
    int x;
    int a, b;
    a= rand() % 4 + 1; 
    b= rand() % 4 + 1;
    x = 0;

    while (x < 10) {
    x++;

    cout << a << "," << b << endl;

    }
    return 0;
}