C语言作业3

#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>
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");
	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");
	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()
{

	 char grade;
    printf("请输入您的等级：");
    scanf("%c",&grade);
    switch(grade)
    {

#include<stdio.h>
int main()
{
    double F;
    printf("请输入华氏温度:\n");
    scanf("%lf", &F);
    printf("对应的摄氏温度为:  %lf\n", 5*(F-32)/9);
    return 0;
}

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分"); break; default: printf("对不起，您的输入有误.请重新输入！"); break; return 0; }

#include<stdio.h>
int main()
{
   int a;
   int b;
   int c;
   int x=152;
    c=x%10;
    b=(x/10)%10;
    a=x/100;
   printf("所给数字152的百位数字是%d，十位数字是%d，个位数字是%d\n",a,b,c);
   return 0;
 }

#include<stdio.h>
#include<math.h>
int main()
{
	double x,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>
int main()
{
   int a;
   int b;
   int c;
   int x=152;
    c=x%10;
    b=(x/10)%10;
    a=x/100;
   printf("所给数字152的百位数字是%d，十位数字是%d，个位数字是%d\n",a,b,c);
   return 0;
 }

#include <stdio.h>
int main()
{
   int a ;
   double f;
   scanf("%d",&a);
   if(a<=50)
     f=0.53*a;
   else
    f=50*0.53+(a-50)*0.05;
   printf("你使用的电费为：%f",f);
   return 0;
}