函式 <題目6：平年與閏年 (函式版)>

程式說明

練習從函式中回傳數值。

題目述

請完成 AskBirthYear() 與 isLeapYear() 函式。

AskBirthYear() 函式會詢問使用者其出生年份，並將該值回傳。

isLeapYear() 有一個傳入的引數，若該引數代表之西元年份為閏年，回傳非 0 值；否則回傳 0 值。



#include <stdio.h>

int AskBirthYear()
{
    int year;
    printf("When were you born? (Input format: 19xx)...>");
    scanf("%d", &year);
    return year ;
}
int isLeapYear ( int year )
{
    if ( ! ( year % 4 ) )
    {
        if ( ! ( year % 100 ) && ( year % 400 ) ) return 0 ;
        else return 1 ;
    }
    else return 0 ;
}
int main()
{
    if (isLeapYear ( AskBirthYear( ) ))
        printf("Hey, you were born in a leap year!");
    else
        printf("You were born in a common year.");
    return 0;

}