Write a c program for reversing a nibbles a given character

Write a c program to reverse nibbles of a given number

A nibble is a unit of digital information that consists of 4 bits, or half a byte. In computer science and information technology, nibbles are often used as a convenient way to work with individual groups of 4 bits in a larger word.

For example, consider an 8-bit number 0xF0. This number can be divided into two nibbles: 0xF (the upper nibble) and 0x0 (the lower nibble). By manipulating these nibbles independently, we can perform certain operations, such as reversing the order of the nibbles, that would be more difficult or cumbersome to perform on the entire 8-bit word.

 C- Program to reverse nibbles of a given number without function

#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=4;i<4;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");
}

Output:

Enter any number: 65
Before reversing the number:
0000 0000 0000 0000 0000 0000  0100  0001

After reversing the number:
0000 0000 0000 0000 0000  0000  0001  0100

C- Program to reverse nibbles of a given number with function

#include<stdio.h>

unsigned char reverseNibble(unsigned char num) {
    return ((num & 0x0F) << 4) | ((num & 0xF0) >> 4);
}

void printBinary(unsigned char num) {
    for (int i = 7; i >= 0; i--) {
        printf("%d", (num & (1 << i)) ? 1 : 0);
    }
}

int main() {
    unsigned char num;
    printf("Enter a number: ");
    scanf("%hhu", &num);
    printf("Given number in binary: ");
    printBinary(num);
    printf("\n");
    num = reverseNibble(num);
    printf("Reversed nibble: ");
    printBinary(num);
    printf("\n");
    return 0;
}

Output:

Enter a number: 65
Given a number in binary: 0100 0001
Reversed nibble: 0001 0100

Conclusion

In this program, reverseNibble function takes an unsigned char as input and returns the reversed nibble of it by swapping the first and fourth bits, and the second and third bits. The printBinary function takes an unsigned char as input and prints its binary representation. The main the function takes the user's input using scanf and stores it in the unsigned char variable num. The nibble of the given number is then reversed using the reverseNibble function, and finally, the binary representation of the reversed nibble is printed using the printBinary function.

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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!