Pass by reference

Read first Task 24

An & parameter changes the caller's variable.

Task

What does & in a parameter list do?

The editor already contains a starting point. Change it until every check passes — the Next task button unlocks when it does.

What you start with

#include <iostream>
using namespace std;

void add_late_fee(int &fee, int amount) {
    fee = fee + amount;
}

int main() {
    int fee = 9000;
    add_late_fee(fee, 500);
    cout << fee << endl;
    return 0;
}

C++ 1 automatic check Section 3 · Functions

Code editor Ctrl + Enter runs

#include <iostream>
using namespace std;

void add_late_fee(int &fee, int amount) {
    fee = fee + amount;
}

int main() {
    int fee = 9000;
    add_late_fee(fee, 500);
    cout << fee << endl;
    return 0;
}

Run your code to see the output and the checks.

Your result

Submit your code to see results

Write your code in the middle column and press Run code.

Checks on this task:

Check 1

One correct answer:

Track progress

0 of 56 tasks complete

Next task unlocks when every check passes.

← Previous

Next task (pass every check first)

Pass by reference

Pass by reference

Task

Why this works