打印閏年 打印素數

//打印閏年
#include <stdio.h>

int main()
{
    int year = 0;
    int count = 0;
    for (year = 1000;year <= 2000;year++)
    {
        if (year%4==0 && year%100!=0)
        {
            printf("%d ", year);
            count++;
        }
        else if (year % 400 == 0)
        {
            printf("%d ", year);
            count++;
        }
    }
    printf("\ncount=%d\n ",count);
    return 0;
}

//打印素數

#include <stdio.h>

int main()
{
    int i = 0;
    int j = 0;
    int count = 0;
    for (i=100;i<=200;i++)
    {
        for (j = 2;j < i;j++)
        {
            if (i%j == 0)
                break;
        }
        if (j == i)
        {
            count++;
            printf("%d ",i);
        }
    }
    printf("\ncount=%d\n ",count);
    return 0;
}

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