# Java Program for Common Divisors of Two Numbers

Given two integer numbers, the task is to find the count of all common divisors of given numbers?

```Input : a = 12, b = 24
Output: 6
// all common divisors are 1, 2, 3,
// 4, 6 and 12

Input : a = 3, b = 17
Output: 1
// all common divisors are 1

Input : a = 20, b = 36
Output: 3
// all common divisors are 1, 2, 4
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

 `// Java implementation of program ` ` `  `class` `Test { ` `    ``// method to calculate gcd of two numbers ` `    ``static` `int` `gcd(``int` `a, ``int` `b) ` `    ``{ ` `        ``if` `(a == ``0``) ` `            ``return` `b; ` ` `  `        ``return` `gcd(b % a, a); ` `    ``} ` `    ``// method to calculate all common divisors ` `    ``// of two given numbers ` `    ``// a, b --> input integer numbers ` `    ``static` `int` `commDiv(``int` `a, ``int` `b) ` `    ``{ ` `        ``// find gcd of a, b ` `        ``int` `n = gcd(a, b); ` ` `  `        ``// Count divisors of n. ` `        ``int` `result = ``0``; ` `        ``for` `(``int` `i = ``1``; i <= Math.sqrt(n); i++) { ` `            ``// if 'i' is factor of n ` `            ``if` `(n % i == ``0``) { ` `                ``// check if divisors are equal ` `                ``if` `(n / i == i) ` `                    ``result += ``1``; ` `                ``else` `                    ``result += ``2``; ` `            ``} ` `        ``} ` `        ``return` `result; ` `    ``} ` ` `  `    ``// Driver method ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` `        ``int` `a = ``12``, b = ``24``; ` `        ``System.out.println(commDiv(a, b)); ` `    ``} ` `} `

Output:

```6
```

Please refer complete article on Common Divisors of Two Numbers for more details!

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