homework160809207刘兆轩

# include <stdio.h>
 
int main()
{
    float a,b,c,m,n,l,k,j,i;
 	printf("请输入三个数:
");
    scanf("%f %f %f",&a,&b,&c);
 
    m = a > b ? a : c;
    n = b > c ? b : c;
    l = m > n ? m : n;
    k = a < b ? a : b;
    j = b < c ? b : c;
    i = k < j ? k : j;
     
    if (a > i && a < l)
    {
        printf("%f %f %f
",l,a,i);
    }
    else if(b > i && b < l)
    {
        printf("%f %f %f",l,b,i);
    }
    else
    {
        printf("%f %f %f",l,c,i);
    }
 
    return 0;
}

#include<stdio.h>
#include<math.h>
int main()
{
	float x,y;
	printf("请输入x:
");
	scanf("%f",&x);
	{
	  	if(x>4)
		y=sqrt(x-4);
    	if(x<-5)
		y=fabs(x);
		if(x>=-5&x<=4)
		y=x+3;
		printf("%f",y);
		} 
	return 0;
}

#include"stdio.h"
int main()
{
   char ch;
   printf("请输入一个字符：
");
   scanf("%c",&ch);
   printf("其大写字符是：%c
",ch-32);
}

#include<stdio.h>
#include<math.h>
int main()
{
	float x,y;
	printf("ÇëÊäÈëx:
");
	scanf("%f",&x);
	{
	  	if(x<1)
		y=(x);
    	if(x>=1&x<=10)
		y=(2*x-1);
		if(x>10)
		y=(3*x-11);
		printf("%f",y);
		} 
	return 0;
}

#include<stdio.h>
int main()
{
	int a;
	printf("请输入成绩:");
	scanf("%d",&a);
	if(a>100||a<0)
{
	printf("????");
}
	else
{
	a=a/10;
	switch(a)
{
case 10:printf("A
");break; 
case 9: printf("A
");break;
case 8: printf("B
");break;
case 7: printf("C
");break;
case 6: printf("D
");break;
default:printf("E
");break;
        }
}
return 0;
}


#include<stdio.h>
 int main()
{
    int n;
 	printf("请输入成绩:");
    scanf("%d",&n);
 	if(n>90)
  {
    printf("A");
  }
    else if(n>=80 && n<=90)
  {
  	printf("B");
  }
    else if(n>=70 && n<=79)
  {
  	printf("C");
   }
    else if(n>=60 && n<=69)
   {
   	printf("D");
   }
    else
   {
   	printf("E");
   }
 	return 0;
}