Question

How to check whether the N bit of a number is set in C++

Answer 1

#include <iostream>
 
using namespace std;
 
int main()
{
    int number = 173;  // 10101101
    int n = 3, set;
 
    set = (number >> n) & 1;
    cout << set << endl;
     
    n = 4;
    set = (number >> n) & 1;
    cout << set << endl;
 
    return 0;
}
  
  
  
/*
run:
  
1
0
  
*/

 

70+ SQL courses for beginners and professionals

Answer 2

#include <iostream>

using namespace std;

bool n_bit_set(int num, int N) { 
    return num & (1 << (N - 1));
} 

int main() {
    int num = 12; // 1100
    int N = 3;  
    
    if (n_bit_set(num, N)) {
        cout << "Bit set" << endl; 
    }
    else {
        cout << "Bit not set" << endl;  
    }
    
    N = 1;  
    if (n_bit_set(num, N)) {
        cout << "Bit set" << endl;  
    }
    else {
        cout << "Bit not set" << endl;  
    }
}



/*
run:

Bit set
Bit not set

*/

 

70+ SQL courses for beginners and professionals