实验二

#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 year;
 printf("input the year:");
    scanf("%d",&year);
    if(year % 100 !=0 && year % 4 == 0 || year % 400 == 0){
        printf("year:%d,month:2,days:29\n",year);
    }else{
        printf("year:%d,month:2,days:28\n",year);
    }
    return 0;
}

#include <stdio.h>
int main(){
    int a,b,c;
    scanf("%d%d%d",&a,&b,&c);
    if((a+b>c)&&(b+c>a)&&(a+c>b)){
        if(a==b&&b==c){
            printf("等边三角形");
        }else if((a==b)||(a==c)||(b==c)){
            printf("等腰三角形");
        }else if(a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a){
            printf("直角三角形");
        }else{
        printf("一般三角形");
        }
    }
    return 0;
}

#include <stdio.h>
int main(){
    double a,rate,tax,profit;
    scanf("%lf",&a);
    int x;
    x = a / 500;
    switch(x){
    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;
    default:rate=0.15;
    }
    tax=a*rate;
    profit=a*(1-rate);
    printf("a=%lf\nrate=%lf\ntax=%lf\nprofit=%lf\n",a,rate,tax,profit);
    return 0;
}