C语言第三次作业

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

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

#include<stdio.h>
int main()
{
    int t=3;
    int g=10;
    int height;
    height=0.5*g*t*t;
    printf("%d",height);
}

#include<stdio.h>
int main()
{
    int money;
    int year;
    int rate;
    double interest;
    printf("请输入money year rate的值");
    scanf("%d %d %d",money,year,rate);
    interest=money*(1+rate,year)-money;
    printf("%f",interest);
     
    
} 

#include<stdio.h>
#include<math.h>
int main()
{
    double x;
    double cost;
    printf("请输入x的值");
    scanf("%lf",&x);
    if(x>0&&x<=50)
       printf("cost=%f",cost=0.53*x);
    else if(x>50)
       printf("cost=%f",cost= 50*0.53+(x-50)*0.58);
    else
       printf("Invalid Value!"); 
} 

#include<stdio.h>
int main()
{
   int x;
   double y;
   printf("请输出x的值");
   scanf("%d",&x);
   if (x==0)
           y=0;
    else
        y=1/(double)x;
        printf("%f",y);
}

#include<stdio.h>
#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>
int main()
{
    char score;
    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"); 
           
    }
}