C++ program to find the first digit in product of an array of numbers

In this article, we will be discussing a program to find the first digit in the product of the elements of the given array.

For example, let us say we have been given an array.

arr = {12, 5, 16}

Then the product is of these elements would be 12*5*16 = 960. Therefore, the result i.e the first digit of the product in this case would be 9.

Example

 Live Demo

#include <bits/stdc++.h> using namespace std; int calc_1digit(int arr[], int x) {    long long int prod = 1;    for(int i = 0;i < x; i++) {       prod = prod*arr[i];    }    while (prod >= 10)       prod = prod / 10;    return prod; } int main() {    int arr[]={12,43,32,54};    cout <<"The first digit will be: " << calc_1digit(arr,4)<< endl; }

Output

The first digit will be: 8