#include <stdio.h>#include <stdlib.h>#include <time.h>int main(void){    int myNumber,yourNumber,count=0;    char c;    do{        srand((unsigned)time(NULL));        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("真聪明，猜对了！\n");            else            printf("您输入的数字不合法，请重新输入！\n");        }        while(yourNumber!=myNumber);            if(count<3)        {            printf("您猜了%d次\n",count);            printf("天才！\n");        }            if(count>=3&&count<8)        {            printf("您猜了%d次\n",count);            printf("智力正常！\n");        }           if(count>8)        {            printf("您猜了%d次\n",count);            printf("笨！\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("请输入三个边长：\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");      }             p=(a+b+c)/2;             s=sqrt(p*(p-a)*(p-b)*(p-c));             printf("面积为：%f\n",s);             D=(a+b+c);             printf("周长为：%f\n",D);    return 0;}

#include <stdio.h> int main ( ) {     double dSalary,dTax=0,dNetIncome=0;    double dValue;      printf("请输入您本月的收入总额（元）：");     scanf("%lf", &dSalary);             dValue=dSalary-3500;     if(dValue<=0.0)             dTax=0.0;     else     {         if     (dValue<=1500)             dTax=dValue*0.03-0.0;          else if(dValue<=4500)             dTax=dValue*0.10-105.0;         else if(dValue<=9000)             dTax=dValue*0.20-555.0;         else if(dValue<=35000)             dTax=dValue*0.25-1005.0;         else if(dValue<=55000)             dTax=dValue*0.30-2755.0;         else if(dValue<=80000)             dTax=dValue*0.35-5505.0;         else             dTax=dValue*0.45-13505.0;     }     dNetIncome=dSalary-dTax;        printf("您本月应缴个人所和税 %.2lf 元，税后收入是 %.2lf 元。\n", dTax, dNetIncome);     return 0; }