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1. A program divides two int values. The divisor is 0, but it comes from user input, so the compiler cannot see it. What happens?

The result is inf, and the program keeps running.The program stops with exit code 136, because the processor refuses the division.The result is 0, and the program keeps running.A std::domain_error is thrown, which the program can catch.

2. Which test correctly checks whether the double named avg holds NaN?

std::isnan(avg)avg == 0.0avg == std::numeric_limits<double>::quiet_NaN()avg < 0.0

3. What does this program print? ``

cpp
#include <iostream>

int main() {
    char c = 'a' + 2;
    std::cout << c << ' ' << 'z' - 'a' << '\n';
}

``

99 25c 26c 2599 26

4. What does this program print? ``

cpp
#include <iostream>

int main() {
    int a = 010;
    int b = 0x10;
    std::cout << a << ' ' << b << '\n';
}

``

10 168 10010 0x108 16

5. What is the bug in this program? ``

cpp
#include <iostream>
#include <vector>

int main() {
    std::vector<int> values = {3, 8, 12, 5};
    int big;
    for (int v : values) {
        if (v > 4) {
            ++big;
        }
    }
    std::cout << big << '\n';
}

``

vector needs its size given before the loop starts.The test should be v >= 4 instead of v > 4.big is never given a starting value, so ++big adds to whatever bits were in memory.The loop should use an index, because a range-for loop cannot count.

Cumulative check