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C program to find the next number power of 2

Here, we are going to learn how to find the next number power of 2 in C programming language?
Submitted by Nidhi, on July 24, 2021

Problem statement

Read an integer number from the user, then find the next number power of 2 using the bitwise right shift operator using C program.

C program to find the next number power of 2

The source code to find the next number power of 2 is given below. The given program is compiled and executed using GCC compile on UBUNTU 18.04 OS successfully.

// C program to find the next number power of 2

#include <stdio.h>
#include <math.h>

int main()
{
    int num = 0;
    int i = 0;

    printf("Enter Number: ");
    scanf("%d", &num);

    num--;

    while (i <= 4) {
        num = num | (num >> (int)pow(2, i));
        i++;
    }

    num++;

    printf("The next number, power of 2 is: %d\n", num);

    return 0;
}

Output

RUN 1:
Enter Number: 18
The next number, power of 2 is: 32

RUN 2:
Enter Number: 3
The next number, power of 2 is: 4

RUN 3:
Enter Number: 123
The next number, power of 2 is: 128

Explanation

In the main() function, we read an integer number from the user and then found the next number, power of 2 using the bitwise right shift (>>) operator and printed the result on the console screen.

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