can someone please help me with this exercise in c++?

Eliminate the global variable in the code at the Section 5.8 by a. passing the balance to the withdraw function . b. passing the balance as a reference parameter to the withdraw function.

int balance = 10000;

void withdraw(double amount) { if ( balance >= amount) { balance = balance - amount ; } } int main() { withdraw (1000); cout << balance << endl; return 0; }