实验四 在分支循环结构中调用自定义函数

/*利用循环计算多个圆柱体体积*/

#include<stdio.h>
int main(void)
{
	int n,i;
	double v,r,h;
//自定义函数声明，计算圆柱体体积
	
double cylinder(double r,double h);
 	printf("Enter n:");
    scanf("%d",&n);
   
		for(i=1;i<=n;i++){
        printf("Enter r and h:");
        scanf("%Lf%Lf",&r,&h);
	    
        if(r<=0||h<=0){
		printf("It is wrong");
	}
	else if(r>0&&h>0){

            v=cylinder(r,h);		    
            printf("v=%.3f\n",v);
		}
	}
		
		return 0;
	}
  
double cylinder(double r,double h)
{
	double result;
	result=3.14*r*r*h;
	return result;
}

　　

/*输入用户的月用电量（千瓦时），计算并输出该用户应支付的电费（元）*/

#include<stdio.h>

int main(void)

{
int i,n;
double x,y;
 printf("Enter n:");
 scanf("%d",&n);

 for(i=1;i<=n;i++)

    {
printf("Enter x:");

scanf("%Lf",&x);
if(x<=0)

        {
 printf("It is wrong");

      }

      else if(x<=50)

      {

          y=0.53*x;

         }

      else

      {
y=50*0.53+0.58*(x-50);

      }
printf("y=%.2f\n",y);

       }

    return 0;

}

　　

/*将上题的电费计算过程放到自定义函数中*/
#include<stdio.h>

int main()

{

   int i,m;

   double x,y;

//自定义函数声明，计算用电量
   double fact(double x);

   double function(double x);

    

   printf("Enter m:");

   scanf("%d",&m);

    

   for(i=1;i<=m;i++){

    printf("Enter x:");

    scanf("%Lf",&x);

    if(x<=0){

        printf("It is wrong");

    }

        else if(x<=50)

        {

            y=fact(x);

        }

        else {

            y=function(x);

        }

        printf("y=%.2f\n",y);   

    }

 

    return 0;

}

double fact(double x)

{

    double result;

    result=0.53*x;

    return result;

}

double function(double x)

{

    double result;

    result=50*0.53+(x-50)*0.58;

    return result;

}