C Program to Round an Integer to Next Lower Multiple of 2 using Bitwise

This C Program uses bitwise operations to round(floor of) an integer to next lower multiple of 2.

Here is source code of the C Program to use bitwise operations to round(floor of) an integer to next lower multiple of 2. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/* 
```

 * C Program to use Bitwise Operations to Round(floor of) an Integer

```
 * to next Lower Multiple of 2
```
```
 */
```
```
#include <stdio.h>
```
```
 
```
```
void main()
```
```
{
```
```
    int x = 1, i, n;
```
```
 
```
```
    printf("enter the number :");
```
```
    scanf("%d", &n);
```
```
    /* for positive values */
```
```
    if (n > 0)
```
```
    {
```
```
        for (; x <= n >> 1;)
```
```
        {
```
```
            x = x << 1;
```
```
        }
```
```
        n = x;
```
```
    }
```
```
    /* for negative values */
```
```
    else
```
```
    {
```
```
        n = ~n;
```
```
        n = n + 1;
```
```
        for (; x <= n >> 1;)
```
```
        {
```
```
            x = x << 1;
```
```
        }
```
```
        x = x << 1;
```
```
        x = ~x;
```
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        x = x + 1;
```
```
        n = x;
```
```
    }
```
```
    printf("%d", n);
```
```
}
```

$ cc bit10.c
$ a.out
enter the number :9
8
$ a.out
enter the number :44
32
$ a.out
enter the number :-20
-32
$ a.out
enter the number :-84
-128

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