Count the number of 1’s and 0’s in a binary array using STL in C++

In this tutorial, we will be discussing a program to count the number of 1’s and 0’s in a binary array using STL in C++.

For this we will be provided with an array. Our task is to count the number of 0’s and 1’s present in the array.

Example

#include <bits/stdc++.h>
using namespace std;
// checking if element is 1 or not
bool isOne(int i){
   if (i == 1)
      return true;
   else
      return false;
}
int main(){
   int a[] = { 1, 0, 0, 1, 0, 0, 1 };
   int n = sizeof(a) / sizeof(a[0]);
   int count_of_one = count_if(a, a + n, isOne);
   cout << "1's: " << count_of_one << endl;
   cout << "0's: " << (n - count_of_one) << endl;
   return 0;
}

Output

1's: 3
0's: 4