Question

How to check if a number is lead number (sum of even digits is equal to the sum of odd digits) in C

Answer 1

#include <stdio.h>

// Function to check if a number is a lead number
int isLeadNumber(int num) {
    int evenSum = 0, oddSum = 0;
    while (num > 0) {
        int digit = num % 10; // Extract the last digit
        if (digit % 2 == 0) {
            evenSum += digit; // Add to even sum if digit is even
        } else {
            oddSum += digit; // Add to odd sum if digit is odd
        }
        num /= 10; // Remove the last digit
    }
    
    return evenSum == oddSum; // Check if sums are equal
}

int main() {
    int number = 615341;
    
    if (isLeadNumber(number)) {
        printf("%d is a lead number.\n", number);
    } else {
        printf("%d is not a lead number.\n", number);
    }
    
    return 0;
}


/* 
run: 

615341 is a lead number. 

*/

 

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