Check if a year is a leap year

Description: Write is_leap(int year). Test 1900, 2000, 2024 and 2026.

Hint:

• Use % and the three rules.

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Solution

#include <iostream>

bool is_leap(int year) {
    return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
}

int main() {
    std::cout << std::boolalpha;
    for (int y : {1900, 2000, 2024, 2026}) {
        std::cout << y << " -> " << is_leap(y) << '\n';
    }
}

How it works

• 1900 is divisible by 100 but not by 400, so it is not a leap year. 2000 is divisible by 400, so it is.

Read C++ Operators.

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