Shift Operations 🧸

a << i is the same as a * pow(2, i)

<<

#include <iostream> 
#include <math.h>
using namespace std;

int main(void) {
    unsigned int a = 5, b = 48;
    for (int i = 0; i < 10; i++) {
        cout << (a << i) << " " << a * pow(2, i) << endl; 
    }
    return 0;
}

/*
5 5
10 10
20 20
40 40
80 80
160 160
320 320
640 640
1280 1280
2560 2560
*/

a >> i is the same as a / (int)pow(2, i)

>>

#include <iostream> 
#include <math.h>
using namespace std;

int main(void) {
    unsigned int a = 48;
    for (int i = 0; i < 10; i++) {
        cout << (a >> i) << " " << a / (int)pow(2, i) << endl; 
    }
    return 0;
}

/*
48 48
24 24
12 12
6 6
3 3
1 1
0 0
0 0
0 0
0 0
*/