"Fundamentals of program design" Chapter 10 function and program structure 7-1 circular volume calculator (20 points)

This problem requires the realization of a commonly used calculator for the volume of circular bodies . The calculation formula is as follows ：

• Sphere volume  V=34​πr3, among r It's the radius of the sphere .
• Cylinder volume  V=πr2h, among r Is the radius of the bottom circle ,h It's high .
• Cone volume  V=31​πr2h, among r Is the radius of the bottom circle ,h It's high .

Input format ：

Before each calculation , The following interface is required to be output ：

1-Ball
2-Cylinder
3-Cone
other-Exit
Please enter your command:

Then read in an integer instruction from standard input .

Output format ：

If the read instruction is 1 or 2 or 3, Then perform the corresponding volume calculation ; If other integers , The program ends .

• When the input is 1 when , Before calculating the volume of the sphere , Print Please enter the radius:, Then read in the radius of the sphere , Complete the calculation ;
• When the input is 2 when , Before calculating the volume of the cylinder , Print Please enter the radius and the height:, Then read in the radius and height of the bottom circle , Complete the calculation ;
• When the input is 3 when , Before calculating the volume of the cone , Print Please enter the radius and the height:, Then read in the radius and height of the bottom circle , Complete the calculation .

The calculation results are output in one line , Keep two decimal places .

sample input ：

1
2
3
2.4 3
0

No blank lines at the end

sample output ：

1-Ball
2-Cylinder
3-Cone
other-Exit
Please enter your command:
Please enter the radius:
33.51
1-Ball
2-Cylinder
3-Cone
other-Exit
Please enter your command:
Please enter the radius and the height:
18.10
1-Ball
2-Cylinder
3-Cone
other-Exit
Please enter your command:

No blank lines at the end

#include<stdio.h>
#include<math.h>
#define pi 3.1415926535
int main()
{
	int n;
	double r,h;
	while(1)
	{
		printf("1-Ball\n2-Cylinder\n3-Cone\nother-Exit\nPlease enter your command:\n");
		scanf("%d",&n);
		switch(n)
		{
			case 1:{
				printf("Please enter the radius:\n");
				scanf("%lf",&r);
				printf("%.2lf\n",4.0*pi*pow(r,3)/3); 
				break;
			}
			case 2:{
				printf("Please enter the radius and the height:\n");
				scanf("%lf%lf",&r,&h);
				printf("%.2lf\n",pi*pow(r,2)*h); 
				break;
			}
			case 3:{
				printf("Please enter the radius and the height:\n");
				scanf("%lf%lf",&r,&h);
				printf("%.2lf\n",pi*pow(r,2)*h/3);
				break;
			}
			default:return 0;
		}
	}
	return 0;
 }