Program that perform conversions ' Cm to Inches or Kilometer to miles

Program is taken from the book C++ IT series,chapter.no.5 exercise program.no,17
Program that input a value and a type of conversions Program should include following conversions

1. Cm = 0.394 inches
2.  liter = 0.246 gallon
3. kilometer = 0.622 miles
4. kilogram = 2.2 pound

using namespace std;
#include<iostream>
#include<conio.h>
#include<cmath>
int main()
{

float value,result;
char conversion;
cout<<"There are four conversions:\n";
cout<<"Enter 'A' for centimeters to inches\n";
cout<<"Enter 'B' for Liter to Gallon\n";
cout<<"Enter 'C' for Kilometer to Miles\n";
cout<<"Enter 'D' for Kilogram to Pounds\n";
cout<<"\n";
cout<<"Enter conversion:";
cin>>conversion;

switch(conversion)
  {
  case 'A':
  case 'a':
  {
  cout<<"Enter centimeters:";
  cin>>value;
  result=value*0.349;
  cout<<value<<" cm"<<"="<<result<<" inches";
  }
break;
case 'B':
  case 'b':
  {
  cout<<"Enter Liter:";
  cin>>value;
  result=value*0.264;
  cout<<value<<" liter"<<"="<<result<<" gallon";
  }
break;
case 'C':
  case 'c':
  {
  cout<<"Enter Kilometers:";
  cin>>value;
  result=value*0.622;
  cout<<value<<" Km"<<"="<<result<<" miles";
  }
break;
case 'D':
  case 'd':
  {
  cout<<"Enter Kilogram:";
  cin>>value;
  result=value*2.2;
  cout<<value<<" Kg"<<"="<<result<<" pound";
  }
break;
  }
   getch();      
   return 0;
}

you can also make a conversion calculator with this program.
you can also find the following  conversion:

• mm to cm
• cm to m
• length conversion
• cm to mm
• mm to m
• km to m
• convert cm to feet
• m to cm
• convert feet to cm
• meters to centimeters
• m to km
• convert cm to in
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• etc