Program to find GCD of two numbers

#include<iostream.h>
int main()
{
int first_number,second_number,gcd,i;
cout<<"Enter First Number : ";
cin>>first_number;

cout<<"Enter Second Number: ";
cin>>second_number;

for(i=1;i<=first_number&&i<=second_number;i++)
{

     if(first_number%i==0 && second_number%i == 0 )
{
                     gcd=i;

    }

}

cout<<"Greatest Common Division (GCD):"<<gcd<<endl;
return 0;
}

******Output******

Enter First Number: 9

Enter Second Number: 24

Greatest Common Division (GCD):3 

What is GCD of two numbers?
 It means a greatest number which divides both numbers
For example: Two numbers are 9 and 24
Numbers which divides both are 1 and 3 in which greatest number is 3
So 3 is the GCD of 9 and 24

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Program in C++ to count heart beats of a person by its age from born

# include <iostream.h>
int main()
{
int age,heartbeats;
cout<<"Enter Age: ";
cin>>age;
cout<<"Enter Number of Heartbeats per min: ";
cin>>heartbeats;

heartbeats = heartbeats * 60; //heartbeats per hour

heartbeats = heartbeats * 24; //heartbeats per day

heartbeats = heartbeats * 365; //heartbeats per year

cout<<"Your Heart has beat "<<heartbeats * age<<" times since you were born."<<endl;

return 0;
}

-----------------------OUTPUT---------------------

 Enter Age: 26

 Enter Number of Heartbeats per min: 70

 Your Heart has beat  956592000  times since you were born.