#include<stdio.h>int main(){    printf("   * * * * * * * * * *\n");    printf("    * * * * * * * * *\n");    printf("     * * * * * * * *\n");    printf("      * * * * * * *\n");    printf("       * * * * * *\n");    printf("        * * * * *\n");    printf("         * * * *\n");    printf("          * * *\n");    printf("           * *\n");    printf("            *\n");    return 0; }

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

#include<stdio.h>int main (){    printf("**********\n");    printf("**********\n");    printf("**********\n");    printf("**********\n");    printf("**********\n");    printf("**********\n");    printf("**********\n");    printf("**********\n");    printf("**********\n");    printf("**********\n");    return 0;}

#include <stdio.h> //等级分数 int main(){    char score;    printf("请输出等级:");     scanf ("%c",&score);//A B C D E     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\n");    break;       }  return 0;}

#include<stdio.h> //华氏温度与摄氏温度的转换 int main(){    int F=100;//F为华氏温度，C为摄氏温度     int C;    C=(5*(F-32)/9);     printf("%d",C);    return 0;}

#include<stdio.h>//求下落距离 int main(){    int t=3;    int g=10;    int H;//下落高度     H=0.5*g*t*t;    printf("f(t)=%d",H);    return 0;    } 

#include<stdio.h>//152的个、十、百位数值int main(){    int a,b,c,d;    a=152;    b=a/100;    c=(a/10)%10;    d=a%10;    printf("百位是%d 十位是%d 个位是%d",b,c,d);    return 0;}

#include<stdio.h>//分段函数 #include<math.h>int main(){    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);} 

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

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