# Ruby program to calculate the Greatest Common Divisor

Ruby Example: Write a program to calculate the Greatest Common Divisor.
Submitted by Nidhi, on December 05, 2021

Problem Solution:

In this program, we will read two integer numbers from the user, and then we will find the Greatest Common Divisor and print the result.

Program/Source Code:

The source code to calculate the Greatest Common Divisor is given below. The given program is compiled and executed successfully.

```# Ruby program to calculate the
# Greatest Common Divisor

num1=0
num2=0
rem=0
x=0
y=0

print "Enter number1: ";
num1 = gets.chomp.to_i;

print "Enter number2: ";
num2 = gets.chomp.to_i;

if (num1 > num2)
x = num1;
y = num2;
else
x = num2;
y = num1;
end

rem = x % y;

while (rem != 0)
x = y;
y = rem;
rem = x % y;
end

print "Greatest Common Divisor is: ",y;
```

Output:

```Enter number1: 24
Enter number2: 21
Greatest Common Divisor is: 3
```

Explanation:

In the above program, we created five variables num1, num2, rem, x, y initialized with 0. Then we read values num1 and num2 from the user. After that, we found the Greatest Common Divisior and printed the result.