#include<stdio.h>

#include<math.h>

int main()

{

     int a,b,c,l,p,s;

     printf("请输入三个数：");

     scanf("%d%d%d",&a,&b,&c);

    if(a+b>c && a-b<c)

    {

        l=a+b+c;

        p=(a+b+c)/2;

        s=sqrt(p*(p-a)*(p-b)*(p-c));

        printf("此三条边可以构成三角形:\n");

        printf("三角形的周长为 :%d\n三角形的面积为：%d",l,s);

    }

    else

        printf("此三条边不可以构成三角形：");

    return 0;

}

#include<stdio.h>

int main()

{

    float a,tax=0,TaxIncome=0;

    printf("请输入您的工资：");

    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您本月应的税后收入为：%f\n",tax,TaxIncome);

    return 0;}

#include<stdio.h>

#include<stdlib.h>

#include<time.h>

int main()

{

    int yournumber,mynumber,count=0;

    char c;

    do

    {

        srand((unsigned)time(NULL));

        mynumber=(rand()%(101-1)+1);

        do

        {

            printf("请输入您所猜的数字：");

            scanf("%d",&yournumber);

            count++;

            if(yournumber>mynumber)

                printf("对不起您猜大了，请重新输入\n");

            else if (yournumber<mynumber)

                printf("对不起您猜小了，请重新输入\n");

            else if(yournumber==mynumber)

                printf("恭喜您猜对了！：\n");

            else

                printf("您的数字不合法，请重新输入:\n");

        }while(yournumber!=mynumber);

    printf("您一共猜了：%d次\n",count);

    if(count<=3)

        printf("Great！您真是一个天才！\n");

    else if(count>4 && count<=7)

        printf("亲，不用担心，您的智力还是正常的哦！\n");

    else

        printf("亲，建议您不要从事虚要智商的活动：\n");

    printf("如果您还想继续的话，请你按y|Y，退出请按n|N:");

    getwchar();

    c=getwchar();

    system("cls");

    } while(c=='y'||c=='Y');

    return 0;

}