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Program Discussion :: Bitwise Operator
Home > Programs > Bitwise Operator

22. Write an efficient program to reverse the given binary number

Answer:

#include <stdio.h>

#include<iostream>
using namespace std;
unsigned int reverseBits(unsigned int num)
{
    unsigned int NO_OF_BITS = sizeof(num) * 8;
    unsigned int reverse_num = 0, i, temp;
    for (i = 0; i < NO_OF_BITS; i++)
    {
        temp = (num & (1 << i));
        if(temp)
            reverse_num |= (1 << ((NO_OF_BITS - 1) - i));
    }
    return reverse_num;
}
/* Driver function to test above function */
int main()
{
    unsigned int x = 2; 
    printf("%u", reverseBits(x));
    getchar();
}

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