Question

How to square every digit of a number in C++

Answer 1

#include <iostream>

int SquareDigits(int number) {
	std::string result = "";

	while (number != 0) {
		int remainder = number % 10;
		number = number / 10;
		result = std::to_string(remainder * remainder) + result;
	}

	return std::stoi(result);
}

int main()
{
	int num = 234;

	num = SquareDigits(num);

	std::cout << num;
}



 
/*
run:
     
4916
     
*/

 

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Answer 2

#include <iostream>

int SquareDigits(int number) {
    int digit, result = 0, mul = 1;
 
    while (number > 0) {
        digit = number % 10;
        result += digit * digit * mul;
        mul *= (digit <= 3) ? 10 : 100;
        number /= 10;
    }
 
    return result;
}
 
int main() {
    int num = 234;
 
    num = SquareDigits(num);
 
    std::cout << num;
}
 
 
 
 
/*
run:
 
4916
 
*/

 

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