cppLogic errorEasy

Bitwise AND precedence error without parentheses

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BugFind the bug and fix the code

What it should do

Check if specific bit flag is active in bitmask. Example: checkBitFlag(5, 4) -> true

What happens instead

Expression evaluates flag == mask before bitwise AND due to lower operator precedence

#include <iostream>

bool checkBitFlag(int bitmask, int flag) {
    // In C++, == has higher precedence than &! (bitmask & (flag == flag))
    return bitmask & flag == flag;
}

int main() {
    std::cout << checkBitFlag(5, 4) << std::endl;
    return 0;
}

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

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Hint 3

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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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#include <iostream> bool checkBitFlag(int bitmask, int flag) { // In C++, == has higher precedence than &! (bitmask & (flag == flag)) return bitmask & flag == flag; } int main() { std::cout << checkBitFlag(5, 4) << std::endl; return 0; }

Bitwise AND precedence error without parentheses

What it should do

What happens instead

More logic errors to practise

Bitwise AND precedence error without parentheses

What it should do

What happens instead

More logic errors to practise