c预言第三次作业周子济160809308

#include<stdio.h>//三角形
int main()
{
    
    printf("*
");
    printf("**
");
    printf("***
");
    printf("****
");
    printf("*****
");
    printf("******
");
    printf("*******
");
    printf("********
");
    printf("*********
");
    printf("**********
");
    
}

#include<stdio.h>//倒三角形 
int main()
{
    printf("**********
");
    printf("*********
");
    printf("********
");
    printf("*******
");
    printf("******
");
    printf("*****
");
    printf("****
");
    printf("***
");
    printf("**
");
    printf("*
");
    return 0 ; 

}

#include<stdio.h>//十行矩形 
int main()
{
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
}

#include<stdio.h>
int main()//计算华氏温度100°F对应的摄氏温度
{
    int F=100;
    int C;
    printf("C=%d",C=5*(F-32)/9);
    return 0;
}

#include<stdio.h>
int main()//100米自由落体
{
    int g=10;
    int t=3;
    int height;
    height=0.5*g*t*t;
    printf("height=%d",height);
    return 0;
}

#include<stdio.h>
int main()//成绩
{
 char score;
 scanf("%c",&score);
 switch(score)
 {
 case'A':
 printf("90~100");
 break;
 case'B':
 printf("80~89");
 break;
 case'C':
 printf("70~79");
 break;
 case'D':
 printf("60~69");
 break;
 case'E':
 printf("0~59");
 break;
 default:
 printf("输入有误");
 break; 
 }
 return 0;
}

#include<stdio.h>
#include<math.h>
int main()//分段函数 
{
    double x;
    double y;
    scanf("%lf",&x);
    if(x>=0)
           y=sqrt(x);
    else
           y=pow(x+1,2)+2*x+1/x;
printf("f(x)=%f",y);
return 0;           
}

#include<stdio.h>
#include<math.h>
int main()//计算存款利息
{
    int year,money;
    double rate,interest;
    printf("请输入存期");
    scanf("%d",&year);
    printf("请输入存款金额");
    scanf("%d",&money);
    printf("请输入年利率");
    scanf("%lf",&rate); 
    interest=money*pow(1+rate,year)-money;
    printf("利息为%f",interest);
return 0;
}

#include<stdio.h>
#include<math.h>
int main()//计算电费 
{
    double x,y;
    scanf("%lf",&x);
    if(x<=50)
            y=0.53*x;
    else
            y=0.53*50+(x-50)*0.58; 
    printf("电费=%f",y);
    return 0; 
}

#include<stdio.h>
int main()//152的个位数字、十位数字和百位数字的值
{
    int a=152;
    int b;
    int c;
    int d;
    b=a%10;
    c=(a/10)%10;
    d=a/100;
    printf("个位数字的值=%d
",b);
    printf("十位数字的值=%d
",c);
    printf("百位数字的值=%d
",d);
    return 0;
}