// find the area of a circle, given radius.
#include <iostream.h>

void main() {


     int a, b;  
     a=10; b=5;


	 // Caluclate the sum of a and b 
     int total = a + b;
     cout << "total, a+b= "  << total << endl; 

	 // Calculate the difference between a and b 
     int difference = a - b;
     cout << "difference,  a-b= "  << difference << endl; 

	 // Calculate the product of a and b 
     int product = a*b;
     cout << "product, a*b= "  << product << endl; 

	 // Calculate the quotient of a and b 
     int quotient = a/b;
     cout << "quotient, a/b= "  << quotient << endl; 

	  //  Calculate the remainder when a is divided by b 
     int remainder = a%b;
     cout << "remainder, a%b= "  << remainder << endl; 

	 // Increment the value of a 
     a++;
     int increment  = a;
     cout << "increment a by one, a++ "  << increment << endl; 

	 // Decrement the value of b 
     b--;
     int decrement = b;
     cout << "decrement b by one, b-- "  << decrement  << endl; 


	 // Increment the value of a by 5
     a +=5;
     int increment_by  = a;
     cout << "increment a by five, a+=5 "  << increment_by << endl; 

	 // decrement the value of a by 6
     b -=6;
     int decrement_by = b;
     cout << "decrement b by one, b-=6 "  << decrement_by  << endl; 


}