Bit Array in C - Sanfoundry

This is a C Program to implement Bit Array. A bit array is an array data structure that compactly stores bits. It can be used to implement a simple set data structure. A bit array is effective at exploiting bit-level parallelism in hardware to perform operations quickly.

A typical bit array stores bt bits, where t is the number of bits in the unit of storage, such as a byte or word, and b is some non-negative integer. If t does not divide the number of bits to be stored, some space is wasted due to internal fragmentation.

Here is source code of the C Program to Implement Bit Array. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
#include <stdio.h>
```
```
 
```
```
#define SIZE (58) /* amount of bits */
```
```
#define ARRAY_SIZE(x) (x/8+(!!(x%8)))
```
```
 
```
```
char get_bit(char *array, int index);
```

void toggle_bit(char *array, int index);

void toggle_bit(char *array, int index) {

    array[index / 8] ^= 1 << (index % 8);

```
}
```
```
 
```
```
char get_bit(char *array, int index) {
```

    return 1 & (array[index / 8] >> (index % 8));

```
}
```
```
int main(void) {
```

    /* initialize empty array with the right size */

```
    char x[ARRAY_SIZE(SIZE)] = { 0 };
```
```
    int i;
```
```
 
```
```
    for (i = 0; i < SIZE; i += 2)
```
```
        toggle_bit(x, i);
```
```
    toggle_bit(x, 56);
```
```
    for (i = 0; i < SIZE; i++)
```

        printf("%d: %d\n", i, get_bit(x, i));

```
 
```
```
    return 0;
```
```
}
```

Output:

$ gcc BitArray.c
$ ./a.out
 
0: 1
1: 0
2: 1
3: 0
4: 1
5: 0
6: 1
7: 0
8: 1
9: 0
10: 1
11: 0
12: 1
13: 0
14: 1
15: 0
16: 1
17: 0
18: 1
19: 0
20: 1
21: 0
22: 1
23: 0
24: 1
25: 0
26: 1
27: 0
28: 1
29: 0
30: 1
31: 0
32: 1
33: 0
34: 1
35: 0
36: 1
37: 0
38: 1
39: 0
40: 1
41: 0
42: 1
43: 0
44: 1
45: 0
46: 1
47: 0
48: 1
49: 0
50: 1
51: 0
52: 1
53: 0
54: 1
55: 0
56: 0
57: 0

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