陈睿豪第三次作业

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

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

#include<stdio.h>
int main()//倒三角
{
    printf("**********\n");
    printf("*********\n");
    printf("********\n");
    printf("*******\n");
    printf("******\n");
    printf("****\n");
    printf("****\n");
    printf("***\n");
    printf("**\n");
    printf("*\n");
}

#include<stdio.h>
int main()//求152个十百位
{
    int a=152;
    int b;
    int c;
    int d;
    b=a/100;
    c=(a/10)%10;
    d=a%10;
    printf("%d %d %d",b,c,d);
}

#include<stdio.h>
int main()//五级制成绩
{
    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;
    }
}

#include<stdio.h>
int main()//华氏温度转摄氏温度
{
    int f;
    int c;
    printf("输入华氏温度: ");
    scanf("%d",&f);
        c=5*(f-32)/9;
    printf("%d",c);
}

#include<stdio.h>
#include<math.h>
int main()//100米小球落下
{
    int g=10;
    int t=3;
    double h;
        h=pow(t,2)*1/2*g;
    printf("%f\n",h);
}

#include<stdio.h>
#include<math.h>
int main() //分段函数
{
    double x;
    double y;
    printf("请输入一个值：");
    scanf("%lf",&x);
    if(x>=0)
        y=sqrt(x);
    else
        y=pow(x+1,2)+2*x+1/x;
    printf("f(x)=%.2f",y);
}

#include<stdio.h>
#include<math.h>
int main()//计算存款利息
{
    int money;
    int year;
    double rate;
    double interest;
    printf("输入存款金额: ");
    scanf("%d",&money);
    printf("输入存期: ");
    scanf("%d",&year);
    printf("输入年利率: ");
    scanf("%lf",&rate);
    interest=money*pow(1+rate,year)-money;
    printf("interest=%.2f\n",interest);
}

#include<stdio.h>
int main()//阶梯电价
{
    float n;
    printf("月用电量: ");
    scanf("%f",&n);
    if(n>50)
        printf("月电费:%f\n",50*0.53+(n-50)*(0.53+0.05));
    else
        printf("月电费:%f\n",n*0.53);
}