Answer to Question #172843 in C++ for JOTHIBASS S

Question

Write a program to find the count of unique digits in a given number N. The number will be passed to the program as the input of type int.

Assumption: The input number will be a positive integer number>=1 and <= 25000.

For e.g.

If the given number is 292, the program should print 2 because there are only 2 unique digits "2" and "9" int this number.

Answer 1

#include <iostream>
using namespace std;

int countUnique(int input)
{
    int u = 0;
    int store = 0;
    int digit = 0;
    while(input > 0) {
        digit = 1 << (input % 10);
        if(!(store & digit)) {
            store |= digit;
            u++;
        }
        input /= 10;
    }
    return u;
}
 
int main()
{
    int n = 292;
    cout << countUnique(n);
    return 0;
}