Write a program to reverse the bits of a given number using for loop

C program to reverse the bits of a given number using for loop

This program in the C programming language is designed to reverse the order of the bits in a given number. The program uses a for loop to iterate through each bit in the number and swap its position with the corresponding bit on the opposite end of the number.

#include<stdio.h>
int main()
{
    int num,pos,i,j,m,n;
    printf("Enter any number:");
    scanf("%d",&num);
    printf("Before reversing the number:\n");
    for(pos=31;pos>=0;pos--)
    {
        printf("%d",num>>pos&1);
    }
    printf("\n");
    for(i=0,j=31;i<j;i++,j--)
    {
        m=num>>i&1;
        n=num>>j&1;
        if(m!=n)
        {
            num=num^1<<i;
            num=num^1<<j;
        }
    }
    printf("After reversing the number:\n");
    for(pos=31;pos>=0;pos--)
    printf("%d",num>>pos&1);
    printf("\n");
}

Enter any number: 10
Before reversing the number:
00000000000000000000000000001010

After reversing the number:
01010000000000000000000000000000

C program that reverses the bits of an integer number. Here's what the program does:

1. The program prompts the user to enter an integer number.
2. The program uses a for loop to print the binary representation of the number before it is reversed.
3. The program uses two variables i and j to traverse the binary representation of the number from left to right and from right to left respectively. Inside the loop, the program uses bitwise operations to extract the bit values at position i and j and checks if they are different.
4. If the bit values at positions i and j are different, the program uses bitwise XOR operations to swap the values of the two bits by flipping them. This is done using bitwise shift operations to create a mask with a 1 in the appropriate bit position and then using bitwise XOR with the original number to flip the bit.
5. The program uses another for loop to print the binary representation of the number after it has been reversed.

Note that this program assumes that the integer number entered by the user is a 32-bit integer since it uses a for loop to traverse the binary representation of the number from position 31 (most significant bit) to position 0 (least significant bit).

Program 02:  C program to reverse the bits of a given number using for loop  with function

#include<stdio.h>
unsigned int reverse_bits(unsigned int num) {
    unsigned int count = sizeof(num) * 8 - 1;
    unsigned int reverse_num = num;

    num >>= 1;
    while (num) {
        reverse_num <<= 1;
        reverse_num |= num & 1;
        num >>= 1;
        count--;
    }
    reverse_num <<= count;
    return reverse_num;
}

int main() {
    unsigned int num;
    printf("Enter a number: ");
    scanf("%u", &num);
    printf("Reversed bits of %u is %u\n", num, reverse_bits(num));
    return 0;
}

Reverses the bits of an unsigned integer number. Here's what the program does:

1. The program defines a function reverse_bits that takes an unsigned integer number as input and returns the reversed bits of that number.
2. Inside the function, the program calculates the number of bits in the input number by subtracting 1 from the number of bits in the integer type (unsigned int) and assigns the value to the variable count.
3. The program initializes a new variable reverse_num with the input number.
4. The program then shifts the input number to the right by 1-bit position and enters a while loop that runs as long as the input number is non-zero.
5. Inside the loop, the program shifts the reverse_num variable to the left by 1 bit position and uses a bitwise OR operation to set the least significant bit of reverse_num to the value of the least significant bit of the input number (num & 1).
6. The program shifts the input number to the right by 1 bit position and decrements the count variable.
7. Once the loop is complete, the program shifts the reverse_num variable to the left by count bit positions to pad the remaining bits with zeros.
8. The program returns the reverse_num variable.
9. In the main function, the program prompts the user to enter an unsigned integer number, reads the input from the console using the scanf function, and calls the reverse_bits function to reverse the bits of the input number.
10. The program then prints the reversed bits of the input number to the console using the printf function.

Note that this implementation assumes the input number is an unsigned integer. If you want to reverse the bits of a signed integer, you'll need to handle the sign bit separately

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Further Reading:

 For further information and examples, Please visit[ C-Programming From Scratch to Advanced 2023-2024]

Note: If you encounter any issues or specific errors when running this program, please let me know and I'll be happy to help debug them!