c预言第三次作业

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

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

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

#include <stdio.h>
int main()
{
    char score;
    printf("请输入数字:"); 
    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>
int main()
{
    int F=100;
    int C;
    C=(5*(F-32)/9); 
    printf("%d",C);
    return 0;
}

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

#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);
    return 0;
}

#include<stdio.h>
#include<math.h>
int main()
{
   int money,year;
    double rate,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=%f
",interest);
    return 0;
}

#include <stdio.h>
int main()
{
     int c ;
   double f;
   scanf("%d",&c);
   if(c<=50)
     {f=0.53*c;}
   else
     {f=50*0.53+(c-50)*0.05;}
   printf("%lf",f);
   return 0;
}