cppType errorEasy

Integer division truncates floating point average

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BugFind the bug and fix the code

What it should do

Calculate arithmetic mean of a vector of integers. Example: computeVectorAverage([1, 2]) -> 1.5

What happens instead

Function returns 1.0 instead of 1.5 due to integer truncation

#include <iostream>
#include <vector>

double computeVectorAverage(std::vector<int> nums) {
    if (nums.empty()) return 0.0;
    int sum = 0;
    for (int n : nums) sum += n;
    // Both sum and nums.size() are integers, performing integer division
    return sum / nums.size();
}

int main() {
    std::cout << computeVectorAverage({1, 2}) << std::endl;
    return 0;
}

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

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This bug belongs to the type errors pattern

Totals that concatenate, sorts that put 10 before 9, comparisons that refuse to run.

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#include <iostream> #include <vector> double computeVectorAverage(std::vector<int> nums) { if (nums.empty()) return 0.0; int sum = 0; for (int n : nums) sum += n; // Both sum and nums.size() are integers, performing integer division return sum / nums.size(); } int main() { std::cout << computeVectorAverage({1, 2}) << std::endl; return 0; }

Integer division truncates floating point average

What it should do

What happens instead

More type errors to practise

Integer division truncates floating point average

What it should do

What happens instead

More type errors to practise