实验2

#include "stdio.h"
int main()
{
    char a,b,c,d,e;
    a=getchar ();
    b=getchar ();
    c=getchar ();
    d=getchar ();
    e=getchar ();
    putchar (a);
    putchar (b);
    putchar (c);
    putchar (d);
    putchar (e);
    return 0;
}

 

#include "stdio.h"
int main()
{
    int i;
    printf("input the year.\n");
    scanf("%d",&i);
        {
            if((i%4==0&&i%100!=0)||i%400==0)
                printf("year:%d,month:2,day:29\n",i);
            else
               printf("year:%d,month:2,day:28\n",i);
         }
    return 0;
}       

 

#include"stdio.h"
main()
{
    int a,b,c;
    scanf("%d%d%d",&a,&b,&c);
    if(a+b<=c||b+c<=a||a+c<=b)
        printf("这不是一个三角形！\n");
    else if(a==b&&b==c&&a==c)
        printf("这是一个等边三角形！\n");
    else if(a==b||b==c||a==c)
        printf("这是一个等腰三角形！\n");
    else if(a*a+b*b==c*c||b*b+c*c==a*a||a*a+c*c==b*b)
        printf("这是一个直角三角形！\n");
    else
        printf("这是一个一般三角形！\n");
    return 0;
} 

 

#include"stdio.h"
main()
{
    double a,rate,tax,profit;  
    scanf("%lf",&a);
    if(a<500)  
        rate=0.00;
    else if(a<1000)  
        rate=0.05;
    else if(a<2000)  
        rate=0.08;
    else if(a<5000)  
        rate=0.10;  
    else  
        rate=0.15;

    tax=a*rate;  
    profit=a-tax;  
    printf("税率：%lf,应缴税款：%lf,实得奖金数：%lf\n",rate,tax,profit);    
    return 0;
} 

 

 

#include"stdio.h"
main()
{
    double a,rate,tax,profit;  
    scanf("%lf",&a);
    switch((int)a/500)
    {  
        case'0':rate=0.00;  
        break;  
        case'1':rate=0.05;  
        break;  
        case'2':rate=0.08; 
        break;  
        case'3':rate=0.08;  
        break;  
        case'4':rate=0.10;  
        break;  
        case'5':rate=0.10;  
        break;  
        case'6':rate=0.10;  
        break;  
        case'7':rate=0.10;  
        break;  
        case'8':rate=0.10;  
        break;  
        case'9':rate=0.10;  
        break;  
        case'10':rate=0.10;  
        break;  
        default:rate=0.15;
    }
    tax=a*rate;  
    profit=a-tax;  
    printf("税率：%lf,应缴税款：%lf,实得奖金数：%lf\n",rate,tax,profit);    
    return 0;
}