cppType errorMedium

Unexpected behavior when converting char* to int*

Time: 0:00

BugFind the bug and fix the code

What it should do

Convert a char* array to an int* array and return the sum of the integers. Example: convertAndSum("1234") -> 10

What happens instead

Undefined behavior or incorrect results when running the code

#include <iostream>

int convertAndSum(const char* data) {
    int length = strlen(data);
    int* intArray = reinterpret_cast<int*>(const_cast<char*>(data));
    int sum = 0;
    for (int i = 0; i < length / sizeof(int); ++i) {
        sum += intArray[i];
    }
    return sum;
}

int main() {
    const char* testData = "1234";
    std::cout << convertAndSum(testData) << 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> int convertAndSum(const char* data) { int length = strlen(data); int* intArray = reinterpret_cast<int*>(const_cast<char*>(data)); int sum = 0; for (int i = 0; i < length / sizeof(int); ++i) { sum += intArray[i]; } return sum; } int main() { const char* testData = "1234"; std::cout << convertAndSum(testData) << std::endl; return 0; }

Unexpected behavior when converting char* to int*

What it should do

What happens instead

More type errors to practise

Unexpected behavior when converting char* to int*

What it should do

What happens instead

More type errors to practise