李喆第三次作业

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

　　

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

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

#include<stdio.h>
int main()
{
    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()
{
    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=33;
    int H;
    H=0.5*g*t*t;
    printf("f(t)=%d",H);
    return 0;    
} 

#include<stdio.h>
int main()
{
    int a,b,c,d;
    a=152;
    b=a/100;
    c=(a/10)%10;
    d=a%10;
    printf(" 百位为%d 十位为%d 个位为%d",b,c,d);
    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);
} 

#include<stdio.h> 
#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>
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);
}