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.

```
/*
```

 * 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()
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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);
```

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

```
}
```
```
 
```

/* Function to find the MSB bit position */

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int int_msb_position(int n)
```
```
{
```
```
    int i = 0, bit;
```
```
    while (i < NUM_BITS_INT)
```
```
    {
```
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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++;
```
```
    }
```
```
    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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