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# Find if the given number is present in the infinite sequence or not

• Last Updated : 03 May, 2021

Given three integers A, B and C. In an infinite sequence, A is the first number, C is the common difference (Si – Si – 1 = C). The task is to check if the number B will appear in the sequence or not.
Examples:

Input: A = 1, B = 7, C = 3
Output: Yes
The sequence will be 1, 4, 7, 10, …
Input: A = 1, B = -4, C = 5
Output: No

Approach: There are two cases:

1. When C = 0, print Yes if A = B else No as the sequence will consist only the number A
2. When C > 0, for any non-negative integer k the equation B = A + k * C must be satisfied i.e. (B – A) / C must be a non-negative integer.

Below is the implementation of the above approach:

## C++

 `// C++ implementation of the approach``#include ``using` `namespace` `std;` `// Function that returns true if``// the sequence will contain B``bool` `doesContainB(``int` `a, ``int` `b, ``int` `c)``{``    ``if` `(a == b)``        ``return` `true``;` `    ``if` `((b - a) * c > 0 && (b - a) % c == 0)``        ``return` `true``;` `    ``return` `false``;``}` `// Driver code``int` `main()``{``    ``int` `a = 1, b = 7, c = 3;` `    ``if` `(doesContainB(a, b, c))``        ``cout << ``"Yes"``;``    ``else``        ``cout << ``"No"``;` `    ``return` `0;``}`

## Java

 `// Java implementation of the approach``class` `GFG``{` `    ``// Function that returns true if``    ``// the sequence will contain B``    ``static` `boolean` `doesContainB(``int` `a, ``int` `b, ``int` `c)``    ``{``        ``if` `(a == b)``        ``{``            ``return` `true``;``        ``}` `        ``if` `((b - a) * c > ``0` `&& (b - a) % c == ``0``)``        ``{``            ``return` `true``;``        ``}` `        ``return` `false``;``    ``}` `    ``// Driver code``    ``public` `static` `void` `main(String[] args)``    ``{``        ``int` `a = ``1``, b = ``7``, c = ``3``;` `        ``if` `(doesContainB(a, b, c))``        ``{``            ``System.out.println(``"Yes"``);``        ``}``        ``else``        ``{``            ``System.out.println(``"No"``);``        ``}``    ``}``}` `// This code contributed by Rajput-Ji`

## Python3

 `# Python3 implementation of the approach` `# Function that returns true if``# the sequence will contain B``def` `doesContainB(a, b, c):``    ``if` `(a ``=``=` `b):``        ``return` `True` `    ``if` `((b ``-` `a) ``*` `c > ``0` `and` `(b ``-` `a) ``%` `c ``=``=` `0``):``        ``return` `True` `    ``return` `False` `# Driver code``if` `__name__ ``=``=` `'__main__'``:``    ``a, b, c ``=` `1``, ``7``, ``3` `    ``if` `(doesContainB(a, b, c)):``        ``print``(``"Yes"``)``    ``else``:``        ``print``(``"No"``)` `# This code is contributed by 29AjayKumar`

## C#

 `// C# implementation of the approach``using` `System;` `class` `GFG``{` `    ``// Function that returns true if``    ``// the sequence will contain B``    ``static` `bool` `doesContainB(``int` `a, ``int` `b, ``int` `c)``    ``{``        ``if` `(a == b)``        ``{``            ``return` `true``;``        ``}` `        ``if` `((b - a) * c > 0 && (b - a) % c == 0)``        ``{``            ``return` `true``;``        ``}` `        ``return` `false``;``    ``}` `    ``// Driver code``    ``public` `static` `void` `Main()``    ``{``        ``int` `a = 1, b = 7, c = 3;` `        ``if` `(doesContainB(a, b, c))``        ``{``            ``Console.WriteLine(``"Yes"``);``        ``}``        ``else``        ``{``            ``Console.WriteLine(``"No"``);``        ``}``    ``}``}` `/* This code contributed by PrinciRaj1992 */`

## PHP

 ` 0 &&``        ``(``\$b` `- ``\$a``) % ``\$c` `== 0)``        ``return` `true;` `    ``return` `false;``}` `// Driver code``\$a` `= 1; ``\$b` `= 7; ``\$c` `= 3;` `if` `(doesContainB(``\$a``, ``\$b``, ``\$c``))``    ``echo` `"Yes"``;``else``    ``echo` `"No"``;` `// This code is contributed``// by Akanksha Rai``?>`

## Javascript

 ``
Output:
`Yes`

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