CODEWITHSUNDEEP
c++
Santiago Uribe Gil
Santiago Uribe Gil

Reputation: 27

Count the amount of a specific number (1) in a 4 digit number

I'm trying to make a program where it asks the user to enter a number of 4 digits, and then the program will ready how many times the number "1" is repeated in the chosen digit. I have no idea how to make the program read the amount of 1's and then output the amount, any ideas please? Thank you.

#include <iostream>
using namespace std;

int main() {

    int num;

    cout << "Ingrese un numero de 4 digitos porfavor. " << endl; //Enter a 4 digit number
    cin >> num;

    if (num > 999 & num < 10000) {
        // count how many 1's the number has

    } else {
        cout << "El numero que usted ha ingresado no tiene unicamente 4 digitos." << endl; //The number you chose doesnt have only 4 digits. (more/less than)
    }


}

Upvotes: 0

Views: 103

Answers (3)

Remy Lebeau
Remy Lebeau

Reputation: 597245

A simple way would be to read the number as a std::string instead of an int (or at least convert the int to std::string with std::to_string()), and then use std::count() to count the '1' characters.

if (num > 999 && num < 10000) {
    std::string s = std::to_string(num);
    int numOnes = std::count(s.begin(), s.end(), '1');
    //...
}

Upvotes: 1

Razib Maharjan
Razib Maharjan

Reputation: 11

Simplest Way Of Doing

#include <iostream>
using namespace std;

int main()
{
    int num, temp, rem, count = 0;
    cout << "Enter 4 digit number:";
    cin >> num;
    temp = num;
    while (temp != 0)
    {
        rem = temp % 10;
        if (rem == 1)
        {
            count++;
        }
        temp = temp / 10;
    }
    cout << "The number of 1 in the four digit number " << num << " = " << count;
    return 0;
}

Upvotes: 1

kcsquared
kcsquared

Reputation: 5409

Another approach is to continually divide the number by 10, and checking whether the last digit is 1:

int numOnes = 0;
int temp = num;
while (temp > 0) {
    if (temp % 10 == 1) numOnes++;
    temp = temp / 10;
}

Upvotes: 1

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