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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
#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
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