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Check if a given number can be represented in given a no. of digits in any base in C++
Suppose we have a number n, and number of digits d. We have to check whether the number n can be represented as d digit number in any base from 2 to 32. Suppose the number n is 8, and d = 4, then this can be represented as 1000 in binary, here the d is 4.
The idea is to check all bases one by one from 2 to 32. We can follow these steps to check the base.
- If the number is smaller than base, and digit is 1, then return true
- if digit is more than one and number is more than base, then remove the last digit from the number by doing num/base, thus reduce the number of digits, then recursively do this again and again.
- Otherwise return false.
Example
#include <iostream> using namespace std; bool isRepresentedInDDigits(int num, int d, int base) { if (d==1 && num < base) return true; if (d > 1 && num >= base) return isRepresentedInDDigits(num/base, --d, base); return false; } bool checkNumber(int num, int d) { // Check for all bases one by one for (int base=2; base<=32; base++) if (isRepresentedInDDigits(num, d, base)) return true; return false; } int main() { int num = 8; int dig = 2; if(checkNumber(num, dig)) cout << "Can be represented"; else cout << "Can not be represented"; }
Output
Can be represented
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