# Check if a number is in given base or not

Given a number as string and a base, check if given number is in given base or not.

Examples:

```Input : str = "1010", base = 2
Output : Yes

Input : str = "1015", base = 2
Output : No

Input : str = "AF87", base = 16
Output : Yes
```

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

The idea is to one by one check if all digits are in given base range. If yes, return true, else return false.

## C++

 `// CPP program to check if given  ` `// number is in given base or not. ` `#include ` `#include ` `using` `namespace` `std; ` ` `  `bool` `isInGivenBase(string str, ``int` `base) ` `{ ` `    ``// Allowed bases are till 16 (Hexadecimal) ` `    ``if` `(base > 16) ` `    ``return` `false``; ` ` `  `    ``// If base is below or equal to 10, then all ` `    ``// digits should be from 0 to 9. ` `    ``else` `if` `(base <= 10)  ` `    ``{ ` `    ``for` `(``int` `i = 0; i < str.length(); i++) ` `        ``if` `(!(str[i] >= ``'0'` `and ` `             ``str[i] < (``'0'` `+ base))) ` `            ``return` `false``; ` `    ``} ` ` `  `    ``// If base is below or equal to 16, then all ` `    ``// digits should be from 0 to 9 or from 'A'  ` `    ``else` `    ``{ ` `    ``for` `(``int` `i = 0; i < str.length(); i++) ` `        ``if` `(! ((str[i] >= ``'0'` `&& ` `                ``str[i] < (``'0'` `+ base)) ||                                  ` `                ``(str[i] >= ``'A'` `&& ` `                 ``str[i] < (``'A'` `+ base - 10)) ` `            ``))                  ` `            ``return` `false``; ` `    ``} ` `    ``return` `true``;  ` `} ` ` `  `// Driver code ` `int` `main() ` `{ ` `    ``string str = ``"AF87"``; ` `    ``if` `(isInGivenBase(str, 16)) ` `    ``cout << ``"Yes"``; ` `    ``else` `    ``cout << ``"No"``; ` `    ``return` `0; ` `} `

## Java

 `// Java program to check if given  ` `// number is in given base or not. ` `class` `Geeks { ` `     `  `static` `boolean` `isInGivenBase(String str, ``int` `base) ` `{ ` `     `  `    ``// Allowed bases are till 16 (Hexadecimal) ` `    ``if` `(base > ``16``) ` `    ``return` `false``; ` ` `  `    ``// If base is below or equal to 10, then all ` `    ``// digits should be from 0 to 9. ` `    ``else` `if` `(base <= ``10``)  ` `    ``{ ` `    ``for` `(``int` `i = ``0``; i < str.length(); i++) ` `        ``if` `(!(str.charAt(i) >= ``'0'` `&& ` `              ``str.charAt(i) < (``'0'` `+ base))) ` `            ``return` `false``; ` `    ``} ` ` `  `    ``// If base is below or equal to 16, then all ` `    ``// digits should be from 0 to 9 or from 'A'  ` `    ``else` `    ``{ ` `    ``for` `(``int` `i = ``0``; i < str.length(); i++) ` `        ``if` `(! ((str.charAt(i) >= ``'0'` `&& ` `                ``str.charAt(i) < (``'0'` `+ base)) ||                              ` `                ``(str.charAt(i) >= ``'A'` `&&  ` `                 ``str.charAt(i) < (``'A'` `+ base - ``10``)) ` `            ``))              ` `            ``return` `false``; ` `    ``} ` `    ``return` `true``;  ` `} ` ` `  `// Driver Class ` `public` `static` `void` `main(String args[]) ` ` `  `{ ` `    ``String str = ``"AF87"``; ` `    ``if` `(isInGivenBase(str, ``16``) == ``true``) ` `    ``System.out.println(``"Yes"``); ` `    ``else` `    ``System.out.println(``"No"``); ` `     `  `} ` `} ` ` `  `// This code is contributed by ankita_saini `

## C#

 `// C# program to check if given  ` `// number is in given base or not. ` `using` `System; ` ` `  `class` `GFG  ` `{ ` `static` `bool` `isInGivenBase(String str,  ` `                          ``int` `bas) ` `{ ` `     `  `    ``// Allowed base are ` `    ``// till 16 (Hexadecimal) ` `    ``if` `(bas > 16) ` `    ``return` `false``; ` ` `  `    ``// If bas is below or equal  ` `    ``// to 10, then all digits ` `    ``// should be from 0 to 9. ` `    ``else` `if` `(bas <= 10)  ` `    ``{ ` `    ``for` `(``int` `i = 0; i < str.Length; i++) ` `        ``if` `(!(str[i] >= ``'0'` `&& ` `              ``str[i] < (``'0'` `+ bas))) ` `            ``return` `false``; ` `    ``} ` ` `  `    ``// If base is below or equal  ` `    ``// to 16, then all digits should  ` `    ``// be from 0 to 9 or from 'A'  ` `    ``else` `    ``{ ` `    ``for` `(``int` `i = 0; i < str.Length; i++) ` `        ``if` `(! ((str[i] >= ``'0'` `&& ` `                ``str[i] < (``'0'` `+ bas)) ||                          ` `               ``(str[i] >= ``'A'` `&&  ` `                ``str[i] < (``'A'` `+ bas - 10)) ` `            ``))          ` `            ``return` `false``; ` `    ``} ` `    ``return` `true``;  ` `} ` ` `  `// Driver Code ` `public` `static` `void` `Main(String []args) ` `{ ` `    ``String str = ``"AF87"``; ` `    ``if` `(isInGivenBase(str, 16) == ``true``) ` `    ``Console.WriteLine(``"Yes"``); ` `    ``else` `    ``Console.WriteLine(``"No"``); ` `} ` `} ` ` `  `// This code is contributed  ` `// by ankita_saini `

## PHP

 ` 16)  ` `    ``return` `false;  ` ` `  `    ``// If base is below or equal to  ` `    ``// 10, then all digits should  ` `    ``// be from 0 to 9.  ` `    ``else` `if` `(``\$base` `<= 10)  ` `    ``{  ` `    ``for` `(``\$i` `= 0; ``\$i` `< ``strlen``(``\$str``); ``\$i``++)  ` `        ``if` `(!(``\$str``[``\$i``] >= ``'0'` `and` `            ``\$str``[``\$i``] < (``'0'` `+ ``\$base``)))  ` `            ``return` `false;  ` `    ``}  ` ` `  `    ``// If base is below or equal to 16,  ` `    ``// then all digits should be from  ` `    ``// 0 to 9 or from 'A'  ` `    ``else` `    ``{  ` `    ``for` `(``\$i` `= 0; ``\$i` `< ``strlen``(``\$str``); ``\$i``++)  ` `        ``if` `(! ((``\$str``[``\$i``] >= ``'0'` `&&  ` `                ``\$str``[``\$i``] < (``'0'` `+ ``\$base``)) ||                              ` `               ``(``\$str``[``\$i``] >= ``'A'` `&&  ` `                ``\$str``[``\$i``] < (``'A'` `+ ``\$base` `- 10))  ` `            ``))              ` `            ``return` `false;  ` `    ``}  ` `    ``return` `true;  ` `}  ` ` `  `// Driver code  ` `\$str` `= ``"AF87"``;  ` ` `  `if` `(isInGivenBase(``\$str``, 16))  ` `    ``echo` `"Yes"``;  ` `else` `    ``echo` `"No"``;  ` ` `  `// This code is contributed by jit_t ` `?> `

Output:

```Yes
```

My Personal Notes arrow_drop_up

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.