cppLogic errorMedium

Unexpected behavior in function argument evaluation

Time: 0:00

BugFind the bug and fix the code

What it should do

The function should multiply two integers and return the result. Example: f(3, 4) -> 12

What happens instead

The function returns an incorrect product, seemingly out of order or undefined.

#include <iostream>

int calculateProduct(int a, int b) {
    return a * b++;
}

int main() {
    int x = 2, y = 3;
    std::cout << calculateProduct(x, y) << std::endl;
    return 0;
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

2:00 remaining

Take a moment to read the bug symptom and trace the code with Run & Check before unlocking Hint 1.

Hint 2

Unlocks after Hint 1

Hint 3

Unlocks after Hint 2

This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

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cppLogic errorMedium

Unexpected behavior in function argument evaluation

Time: 0:00

BugFind the bug and fix the code

What it should do

The function should multiply two integers and return the result. Example: f(3, 4) -> 12

What happens instead

The function returns an incorrect product, seemingly out of order or undefined.

#include <iostream>

int calculateProduct(int a, int b) {
    return a * b++;
}

int main() {
    int x = 2, y = 3;
    std::cout << calculateProduct(x, y) << std::endl;
    return 0;
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

2:00 remaining

Take a moment to read the bug symptom and trace the code with Run & Check before unlocking Hint 1.

Hint 2

Unlocks after Hint 1

Hint 3

Unlocks after Hint 2

This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

Unexpected behavior in function argument evaluation

What it should do

What happens instead

More logic errors to practise

Unexpected behavior in function argument evaluation

What it should do

What happens instead

More logic errors to practise