Product of Digits in C

February 24, 2026

C Program to Solve Two Sum Using Brute Force (With Algorithm & Output)

Introduction The Two Sum problem is a popular coding interview question where we must find two indices of an array whose values add up to a given target. This program demonstrates a simple brute-force solution in C using nested loops and dynamic memory allocation. Problem Statement Given an integer array and a target value, return the indices of the two numbers such that they add up to the target. Each input has exactly one solution, and the same element cannot be used twice. The result should return the indices, not the values. If no solution exists, return NULL. Algorithm / Logic Explanation Start the program. Traverse the array using a loop from index 0 to numsSize - 1 . Inside this loop, use another loop starting from i + 1 to numsSize - 1 . For every pair (i, j) , check if nums[i] + nums[j] == target . If condition becomes true: Allocate memory for 2 integers using malloc() . Store indices i and j . Set returnSize = 2 . Return the result poi...

A supermarket maintains a pricing format for all its products. A value N is printed on each product. When the scanner reads the value N on the item, the product of all the digits in the value N is the price of the item.

The task here is to design the software such that given the code of any item N the product (multiplication) of all the digits of value should be computed (price).

Example 1:

Input :

5244 -> Value of N

Output :
160 -> Price

Explanation:

From the input above

Product of the digits 5, 2, 4, 4

5 * 2 * 4 * 4 = 160

Hence, output is 160.


#include <stdio.h>

int subtractProductAndSum(int n)
{
    int product = 1;
    int sum = 0;

    while (n > 0)
    {
        int digit = n % 10;
        product *= digit;
        sum += digit;
        n /= 10;
    }

    return product - sum;
}

int main()
{
    int n;
    printf("Enter the value of N: ");
    scanf("%d", &n);

    int result = subtractProductAndSum(n);

    printf("Result (Product - Sum of digits): %d\n", result);

    return 0;
}

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#CProgramming #NumberProblems #DigitsProduct #CodingPractice #1printf

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C Program to Solve Two Sum Using Brute Force (With Algorithm & Output)