Question

How to check if an integer include specific digits x times in C++

Answer 1

#include <iostream>

bool checkDigitOccurrences(int number, char digit, int xtimes) {
    std::string numStr = std::to_string(number);
    int count = 0;

    for (char ch : numStr) {
        if (ch == digit) {
            count++;
        }
    }

    return count == xtimes;
}

int main() {
    int number = 7097175;
    char digit = '7';
    int xtimes = 3;

    std::cout << checkDigitOccurrences(number, digit, xtimes);
}



/*
run:

1

*/

 

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Answer 2

#include <iostream>

bool checkDigitOccurrences(int n, int xtims, int digit) {
    int count = 0;
         
    while (n > 0) {
        if (n % 10 == digit)
            count++;
        n = n / 10;
    }
         
    return count == xtims;
}


int main() {
    std::cout << checkDigitOccurrences(7097175, 3, 7) << "\n";
     
    std::cout << checkDigitOccurrences(70975, 3, 7);
}



/*
run:

1
0

*/

 

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