C Program to Find MSB Position using Function

This C Program uses function to return the MSB position of unsigned integer.

Here is source code of the C Program use function to return the MSB position of unsigned integer. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

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

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 */
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#include <stdio.h>
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#define NUM_BITS_INT 32
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int int_msb_position(int n);
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void main()
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{
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    int n, pos;
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    printf("Enter a number : ");
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    scanf("%d", &n);
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    pos = int_msb_position(n);
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    printf("\nPosition of MSB bit = %d\n", NUM_BITS_INT - (pos + 1));

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}
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```
 
```

/* Function to find the MSB bit position */

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int int_msb_position(int n)
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{
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    int i = 0, bit;
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    while (i < NUM_BITS_INT)
```
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    {
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        bit = n & 0x80000000;
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        if (bit == -0x80000000)
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           {
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            bit = 1;
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        }
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           if (bit == 1) 
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            break;
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        n = n << 1;
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        i++;
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    }
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    return i;
```
```
}
```

$ cc bit24.c
$ a.out
Enter a number : 127
 
Position of MSB bit = 6
 
Enter a number : 259
 
Position of MSB bit = 8
 
Enter a number : 5
 
Position of MSB bit = 2

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