Why does my while loop let me continuously enter values, but the loop does nothing

#include <iosteam>

int main(){
int money, coupons, chocolate, ogCoupons, newChocolate, couponsUsed;

std :: cout << "How many chocolate bars do you want to buy? " << std :: endl;
std :: cin >> money;

coupons = money;
chocolate = money;
ogCoupons = coupons;

std :: cout << "\nYou got " << coupons << " coupons." << std :: endl;


while(coupons >= 6)
    {
        coupons -= 6;
        couponsUsed = (ogCoupons - coupons); //I think problem lies here
        chocolate++;
        newChocolate = couponsUsed;
        coupons += newChocolate;
        ogCoupons = coupons;
    } 

std :: cout << "\nYou have " << coupons << " coupons left and " <<  chocolate << " chocolate bars." << std :: endl;

return 0;
}

Code it supposed to do this: If you have 22 dollars, you can initially buy 22 chocolate bars.  This will give you 22 coupons.  You can redeem 18 of them for 3 additional chocolate bars, for a total now of 25.  These 3 additional bars gives you 3 additional coupons, for a total of 7 now.  This gives you enough coupons to buy one more chocolate bar, with one more coupon, for a total now of 26 chocolate bars and 2 left over coupons.

The problem lies withing the while loop. When I try to subtract the two variables in couponsUsed the loop lets me input random integers and character, but nothing happens.

Your code is confusing. Maybe think of it this way:

while (coupons >= 6) {
     // So far, so good. If we're in this loop, we have enough
     // coupons to trade for a chocolate bar. So buy exactly one:
     ++chocolate;
     coupons -= 6;

     // And because we bought a chocolate bar, we get one more coupon:
     ++coupons;
}

I didn't test it, but that's a lot easier to read and make sense of. Give it a try.

A common error in programming is to make the problem too complicated. If things stop making sense, then back away and ask if you're keeping it simple.

Also, it's better to define variables when you're about to use them. You define a bunch of variables at the top of your function that you ultimately don't really need, or if you do, only within the loop. So declare them where you use them. I'd write the top more like this:

int money;

std :: cout << "How many chocolate bars do you want to buy? " << std :: endl;
std :: cin >> money;

// Chocolate bars are $1, so we get 1 bar per dollar
// and 1 coupon for each bar we buy.
int coupons = money;
int chocolate = money;

And you flat out don't need the other variables.