猜数字
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
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("数字太大请您重新输入
");
else if(yournumber<mynumber)
printf("数字太小请您重新输入
");
else if(yournumber!=mynumber)
printf("您输入的数字不合法，请重新输入
");
}
while(yournumber!=mynumber);
{
if(count<=3)笨
printf("天才！
");
else if(count>3 && count<=7)
printf("智力正常！
");
else
printf("！");
}
printf("您一共猜了%d次
",count);
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;
}
三角形
#include<stdio.h>
#include<math.h>
int main()
{
int a=0,b=0,c=0,z;
float s,ave;
printf("请输入三条边：
");
scanf("%d%d%d",&a,&b,&c);
if(a+b>=c && a+c>=b && b+c>=a)
{
s=(a+b+c)*1/2.0;
ave=sqrt(s*(s-a)*(s-b)*(s-c));
printf("面积为：%f
",ave);
z=a+b+c;
printf("周长为：%d
",z);
}
else
printf("不能构成三角形。
");
return 0;
}
个人所个税
#include <stdio.h>
int main ( ){ float salary,tax=0,afterTaxIncome=0,i; int t; printf("请输入您本月的收入总额（元）："); scanf("%f", &salary); i=salary-3500; { if(i<=0) t=0; else if(i<=1500) t=1; else if(i>1500 && i<=4500) t=2; else if(i>4500 && i<=9000) t=3; else if(i>9000 && i<=35000) t=4; else if(i>35000 && i<=55000) t=5; else if(i>55000 && i<=80000) t=6; else if(i<80000) t=7; } switch(t) { case 1:printf("tax=(s-3500)*0.03 TaxIncome=s-tax
"); break; case 2:printf("tax=(s-3500)*0.1 TaxIncome=s-tax
");break; case 3: printf("tax=(s-3500)*0.2 TaxIncome=s-tax
");break; case 4:printf("tax=(s-3500)*0.25 TaxIncome=s-tax
"); break; case 5:printf("tax=(s-3500)*0.3 TaxIncome=s-tax
");break; case 6: printf("tax=(s-3500)*0.35 TaxIncome=s-tax
");break; default:printf("tax=(s-3500)*0.45 TaxIncome=s-tax
");break; } afterTaxIncome=salary-tax; printf("您本月应缴个人所和税 %.2f 元，税后收入是 %.2f 元。
", tax, afterTaxIncome); return 0;