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C Programming Code Examples

C > Bitwise Operators Code Examples

C Program that uses Function to return MSB position of unsigned Integer

C Program that uses Function to return MSB position of unsigned Integer

    #include <stdio.h>

    #define NUM_BITS_INT 32

    int int_msb_position(int n);

    void main()

    {

        int n, pos;

        printf("Enter a number : ");

        scanf("%d", &n);

        pos = int_msb_position(n);

        printf("\nPosition of MSB bit = %d\n", NUM_BITS_INT - (pos + 1));

    }

    /* Function to find the MSB bit position */

    int int_msb_position(int n)

    {

        int j = 0, bit;

        while (j < NUM_BITS_INT)

        {

            bit = n & 0x80000000;

            if (bit == -0x80000000)

               {

                bit = 1;

            }

               if (bit == 1) 

                break;

            n = n << 1;

            j++;

        }

        return j;

    }

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