display.cpp

本源码说明了如何在c和c++编译器中显示调试结果。

#include <stdafx.h> #include <string> #include <fstream> #include <iostream> 在Visual c++ 2005中，头文件为stdafx.h下，需加代码如上

#include <iostream> 
using namespace std; 

const double pi=3.1415; 

float c(float r) 
{ 
return 2.0*pi*r; 
} 

float s(float r) 
{ 
return pi*r*r; 
} 

float v(float r) 
{ 
return 4.0*r*r*r*pi/3.0; 
} 

float V(float r,float h) 
{ 
return pi*r*r*h; 
} 

void main() 
{ 
float r,h; 
char m; 
cout<<"请输入要计算的项目:圆面积(s);圆周长(c);圆球体积(v);圆柱体积(V):"; 
cin>>m; 
switch(m) 
{ 
case 's':cout<<endl<<"请输入圆半径r:"; 
cin>>r; 
cout<<endl<<"圆的面积为"<<s(r); 
break; 

case 'c':cout<<endl<<"请输入圆半径r:"; 
cin>>r; 
cout<<endl<<"圆的周长为"<<c(r); 
break; 

case 'v':cout<<endl<<"请输入球的半径r:"; 
cin>>r; 
cout<<endl<<"球的体积为"<<v(r); 
break; 

case 'V':cout<<endl<<"请输入圆柱的底面半径r:"; 
cin>>r; 
cout<<endl<<"请输入圆柱的高h:"; 
cin>>h; 
cout<<endl<<"圆柱的体积为"<<V(r,h); 
break; 
default: cout<<"您输入的项目不存在!!!"<<endl; 
} 
} 





如果已知了r=2.5,h=4.0,那么就好办了; 
void main() 
{ 
float r(2.5),h(4.0); 
char m; 
cout<<"请输入要计算的项目:圆面积(s);圆周长(c);圆球体积(v);圆柱体积(V):"; 
cin>>m; 
switch(m) 
{ 
case 's': 
cout<<endl<<"圆的面积为"<<pi*r*r; 
break; 

case 'c': 
cout<<endl<<"圆的周长为"<<2.0*pi*r; 
break; 

case 'v': 
cout<<endl<<"球的体积为"<<3.0*pi*r*r*r/4.0; 
break; 

case 'V':cout<<endl<<"圆柱的体积为"<<pi*r*r*h; 
break; 
default: cout<<"您输入的项目不存在!!!"<<endl; 
} 
}