C语言 homework (3)

 

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    int yournumber,mynumber,count=;
    char c;
    do{
        srand((unsigned)time(NULL));
        mynumber=(rand()%(-)+);
    do{
    printf("请输入您所猜的数字：");
    scanf("%d",&yournumber);
            count++;
            if(yournumber>mynumber)
                printf("大了\n");
            else if (yournumber<mynumber)
                printf("小了\n");
            else (yournumber==mynumber)
                printf("猜对了！：\n");
      }while(yournumber!=mynumber);
    printf("您一共猜了：%d次\n",count);
    if(count<=)
        printf("完美 你好聪明\n");
    else if(count> && count<=)
        printf("你智力还算正常的哦！\n");
    else
        printf("哎呦 还是多干干不用脑子的事儿吧：\n");
    printf("继续请按y|Y，退出请按n|N:");
    getwchar();
    c=getwchar();
    system("cls");
    } while(c=='y'||c=='Y');
    return ;
}    

#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("可以构成三角形:\n");
        printf("三角形周长为 :%d\n三角形面积为：%d",l,s);
}
    else
        printf("不可以构成三角形：");
    return 0;
}

#include<stdio.h>
int main()
{
    float a,tax=,taxincome=;
    printf("请输入您的工资：");
    scanf("%f",&a);
    if(a<=)
    {
        tax=(a-)*0.03;
        taxincome=a-tax;
    }
    else if(a>||a<=)
    {
        tax=(a-)*0.1-;
        taxincome=a-tax;
    }
    else if(a>||a<=)
    {
        tax=(a-)*0.2-;
        taxincome=a-tax;
    }
    else if(a>||a<=)
    {
        tax=(a-)*0.25-;
        taxincome=a-tax;
    }
    else if(a>||a<=)
    {
        tax=(a-)*0.3-;
        taxincome=a-tax;
    }
    else if(a>||a<=)
    {
        tax=(a-)*0.35-;
        taxincome=a-tax;
    }
    else
    {
        tax=(a-)*0.45-;
        taxincome=a-tax;
    }
    printf("您本月应交税为：%f\n您本月的税后收入为：%f\n",tax,taxincome);
    return ;}