第二次实验

#include<stdio.h>
int main(){
    double a,rate,tax,profit;
    int i;
    for(i=0;i<5;i++){
        scanf("%lf",&a);
        switch((int)a/1000){
            case 0:
                switch((int)a/500){
                    case 0:rate=0.00;break;
                    case 1:rate=0.05;break;}
                break;
            case 1:rate=0.08;break;
            case 2:rate=0.10;break;
            case 3:rate=0.10;break;
            case 4:rate=0.10;break;
            default:rate=0.15;
        }
        tax=a*rate;
        profit=a-tax;
        printf("a=%.2lf rate=%.2lf tax=%.2lf profit=%.2lf \n",a,rate,tax,profit);
    }
    return 0;
}

#include<stdio.h>
int main(){
    double a,rate,tax,profit;
    int i;
    for(i=0;i<5;i++){
        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("a=%.2lf rate=%.2lf tax=%.2lf profit=%.2lf \n",a,rate,tax,profit);
    }
    return 0;
}

#include<stdio.h>
int main(){
    int a[4];
    int i,j,l;
    for(i=0;i<5;i++){
        scanf("%d %d %d",&a[1],&a[2],&a[3]);
        for(j=1;j<=2;j++){
            for(l=j+1;l<=3;l++){
                if(a[l]>a[j]){
                a[0]=a[l];
                a[l]=a[j];
                a[j]=a[0];
                }
            }
        }//交换abc，使a>b>c
        printf("%d %d %d",a[1],a[2],a[3]);
        if(a[1]<(a[2]+a[3])){
            printf("是");
            if(a[1]==a[2]||a[1]==a[3]||a[2]==a[3]){
                if(a[1]==a[2]&&a[1]==a[3]&&a[2]==a[3]){
                printf("等边");
                }else{
                printf("等腰");
                }
            }
            if((a[1]*a[1])==(a[2]*a[2]+a[3]*a[3])){
                printf("直角");
            }    
        }else{
            printf("不是");
        }
        printf("三角形\n");
    }
    return 0;
}

#include<stdio.h>
int main(){
    int i;
    for(i=0;i<5;i++){
        putchar(getchar());
    }
    printf("\n");
    return 0;
}

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