isleap.cpp

来自「C++&datastructure书籍源码,以前外教提供现在与大家共享」· C++ 代码 · 共 35 行

#include <iostream>
using namespace std;

// illustrates user-defined function for determining leap years

bool IsLeapYear(int year)
// precondition: year > 0
// postcondition: returns true if year is a leap year, else returns false 
{
    if (year % 400 == 0)         // divisible by 400
    {   return true;
    }
    else if (year % 100 == 0)    // divisible by 100
    {   return false;
    }
    else if (year % 4 == 0)      // divisible by 4
    {   return true;
    }
    return false;
}

int main()
{
    int year;
    cout << "enter a year ";
    cin >> year;
    if (IsLeapYear(year))
    {   cout << year << " has 366 days, it is a leap year" << endl;
    }
    else
    {   cout << year << " has 365 days, it is NOT a leap year" << endl;
    }
    return 0;
}