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C program to swap two nibbles of a byte.

This program will swap two nibbles of a byte, as we know that one byte has 8 bits or 2 nibbles. Hence one nibble has 4 bits, by shifting 4, 4 bits we can swap nibbles of a byte.

Swapping nibbles of a byte using C program

    /*C program to swap two nibbles of a given byte*/

    #include <stdio.h>
    /* function : swapTwoNibbles, to swap two nibbles of a given byte.*/
    unsigned char swapTwoNibbles(unsigned char n)
    {
	    unsigned char num;
	    num= ( (n & 0x0F)<<4 | (n & 0xF0)>>4 );
        return num;
    }
 
    int main()
    {
        unsigned char number;
	    unsigned char revNumber;
	    printf("Enter an integer number (One byte number):");
	    scanf("%u",&number);

	    revNumber=swapTwoNibbles(number);
        printf("\nEntered Number was : %u \nNumber after swapping nibbles : %u",number,revNumber);

        return 0;
    }

    Enter an integer number (One byte number):200

    Entered Number was : 200
    Number after swapping nibbles : 140




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