7-42 圓形體體積計算器 (20分)
本題要求實現一個常用圓形體體積的計算器。計算公式如下:
- 球體體積 V=34πr3,其中r是球體半徑。
- 圓柱體體積 V=πr2h,其中r是底圓半徑,h是高。
- 圓錐體體積 V=31πr2h,其中r是底圓半徑,h是高。
輸入格式:
在每次計算之前,要求輸出如下界面:
1-Ball 2-Cylinder 3-Cone other-Exit Please enter your command:
然后從標准輸入讀進一個整數指令。
輸出格式:
如果讀入的指令是1或2或3,則執行相應的體積計算;如果是其他整數,則程序結束運行。
- 當輸入為1時,在計算球體體積之前,打印
Please enter the radius:
,然后讀入球體半徑,完成計算; - 當輸入為2時,在計算圓柱體體積之前,打印
Please enter the radius and the height:
,然后讀入底圓半徑和高,完成計算; - 當輸入為3時,在計算圓錐體體積之前,打印
Please enter the radius and the height:
,然后讀入底圓半徑和高,完成計算。
計算結果在一行內輸出,保留小數點后兩位。
輸入樣例:
1
2
3
2.4 3
0
輸出樣例:
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:
#include<stdio.h>
#include<math.h>
void start()
{
printf("1-Ball\n");
printf("2-Cylinder\n");
printf("3-Cone\n");
printf("other-Exit\n");
printf("Please enter your command:\n");
}
int main()
{
int n;
start();
double pi =atan(1)*4;
double result;
double radius;
double height;
while(scanf("%d",&n)!=EOF)
{
switch(n)
{
case 1:printf("Please enter the radius:\n");
scanf("%lf",&radius);
result=4/3.0*pi*pow(radius,3);
printf("%.2f\n",result);
break;
case 2:printf("Please enter the radius and the height:\n");
scanf("%lf %lf",&radius,&height);
result=height*pi*pow(radius,2);
printf("%.2f\n",result);
break;
case 3:printf("Please enter the radius and the height:\n");
scanf("%lf %lf",&radius,&height);
result=1/3.0*height*pi*pow(radius,2);
printf("%.2f\n",result);
break;
default:
return 0;
}
start();
}
return 0;
}