第三次作业。

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
//猜数字游戏
int main(void)
{
    int myNumber,yourNumber,count=0;
    char c;
    do{
        //指定种子值为现在的时间
        srand((unsigned)time(NULL));
        //产生[1,100]之间的随机数
        myNumber=(rand()%(101-1))+1;
        do{
            printf("请输入您猜想的数值：");
            scanf("%d",&yourNumber);
            count++;
            if(yourNumber<myNumber)
            printf("数字太小请重新输入！\n");
            else if(yourNumber>myNumber)
            printf("数字太大请重新输入！\n");
            else if(yourNumber==myNumber)
            printf("恭喜您，猜对了！\n");
            else
            printf("您输入的字符不合法，请重新输入！\n"); 
        } 
        while(yourNumber!=myNumber);
        printf("您一共猜了%d次\n",count);
        if(count<3)
        {
            printf("您在第%d次就猜对了！\n",count);
            printf("您真是天才！\n"); 
        }
        if(count>=3&&count<8)
        {
            printf("您在第%d次猜对了！\n",count);
            printf("智商正常！\n");
        }
        if(count>8)
        {
            printf("您在第%d次猜对了！\n",count);
            printf("真是太笨了！\n");
        } 
        printf("继续请按Y/y,退出请按N/n");
        getchar();
        c=getchar();
        system("cls");
    }while(c==‘Y‘||c==‘y‘);
    return 0;
} 

#include <stdio.h>
#include <math.h>
int main()
{
    float a,b,c,p,s,d;
    printf("请输入边长：\n");
    scanf("%f%f%f",&a,&b,&c);
    if(a+b>c&&a+c>b&&b+c>a)
    {
         printf("能够构成三角形\n"); 
    }
    else{
    
        printf("不能构成三角形\n");
        return 0;
    }
    p=(a+b+c)/2;
    s=sqrt(p*(p-a)*(p-b)*(p-c));
    printf("面积是：%f\n",s);
    d=(a+b+c);
    printf("周长是：%f\n",d);
    return 0; 
}

#include <stdio.h>
int main()
{
    float a,tax=0,TaxIncome=0;
    printf("请输入您本月收入总额（元）：");
    scanf("%f",&a);
    if(a<=1455)
    {
        tax=(a-3500)*0.03-0;
        TaxIncome=a-tax;
    }
    else if(a>1455 || a<=4155)
    {
        tax=(a-3500)*0.1-105;
        TaxIncome=a-tax; 
    }
    else if(a>4155 || a<=7755)
    {
        tax=(a-3500)*0.2-555;
        TaxIncome=a-tax;
    }
    else if(a<7755 || a<=27255)
    {
        tax=(a-3500)*0.25-1005;
        TaxIncome=a-tax;
    }
    else if(a>27255 || a<=41255)
    {
        tax=(a-3500)*0.3-2755;
        TaxIncome=a-tax;
    }
    else if(a>41255 || a<=57505)
    {
        tax=(a-3500)*0.35-5505;
        TaxIncome=a-tax;
    }
    else
    {
        tax=(a-3500)*0.45-13505;
        TaxIncome=a-tax;
    }
    printf("您本月应缴税为：%f\n您本月的税后收入为：%f\n",tax,TaxIncome);
    return 0;
}

#include <stdio.h>
int main()
{
    float salary,tax=0,TaxIncome=0,c;
    int a;
    printf("请输入您的工资：\n");
    scanf("%f",&salary);
    c=salary-3500;
    {
        if(c<=0)
        a=0;
        if(c<=1455)
        a=1;
        else if(c>1455&&c<=4155)
        a=2;
        else if(c>4155&&c<=7755)
        a=3;
        else if(c>7755&&c<=27255)
        a=4;
        else if(c>27255&&c<=41255)
        a=5;
        else if(c>41255&&c<=57505)
        a=6;
        else
        a=7;
    }
    switch(a)
    {
        case 1:printf("tax=(c-3500)*0.03-0 TaxIncome=c-tax\n");
        break;
        case 2:printf("tax=(c-3500)*0.1-105 TaxIncome=c-tax\n");
        break;
        case 3:printf("tax=(c-3500)*0.2-555 TaxIncome=c-tax\n");
        break;
        case 4:printf("tax=(c-3500)*0.25-1005 TaxIncome=c-tax\n");
        break;
        case 5:printf("tax=(c-3500)*0.3-2755 TaxIncome=c-tax\n");
        break;
        case 6:printf("tax=(c-3500)*0.35-5505 TaxIncome=c-tax\n");
        break;
        default:printf("tax=(c-3500)*0.45-13505 TaxIncome=c-tax\n");
        break;
    }
    salary=TaxIncome;
    printf("您本月应缴税：%f元\n 您本月的税后收入为：%f元\n",tax,TaxIncome);
    return 0;
}