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Commit cbb3118

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Merge pull request #242 from aelshinawy/c-bit-manipulation
[Snippets] Added a few bit-manipulation snippets in C
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---
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title: Clear ith bit
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description: Clear the ith bit of a number and returns the resulting number
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tags: bit-manipulation, number, clear
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author: aelshinawy
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---
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```c
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int clear_ith_bit(int n, int i) {
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return n & ~(1 << i);
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}
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// Usage:
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clear_ith_bit(10, 1); // Returns: 8
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clear_ith_bit(10, 3); // Returns: 2
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```
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---
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title: Count Set Bits
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description: Counts the number of set bits in an int
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tags: bit-manipulation, count
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author: aelshinawy
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---
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```c
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int count_set_bits(int n) {
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int count = 0;
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while (n) {
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n &= (n - 1);
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count++;
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}
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return count;
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}
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// Usage:
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count_set_bits(5); // Returns: 2
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count_set_bits(255); // Returns: 8
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count_set_bits(8); // Returns: 1
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```
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---
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title: Get ith bit
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description: Get the i-th bit of a number
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tags: bit-manipulation, number, get
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author: aelshinawy
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---
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```c
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int get_ith_bit(int n, int i) {
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return (n >> i) & 1;
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}
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// Usage:
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get_ith_bit(10, 0); // Returns: 0
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get_ith_bit(10, 1); // Returns: 1
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get_ith_bit(10, 2); // Returns: 0
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get_ith_bit(10, 3); // Returns: 1
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```
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---
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title: Is Odd
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description: Check if a number is odd
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tags: bit-manipulation, number, is-odd
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author: aelshinawy
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---
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```c
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bool is_odd(int n) {
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return n & 1;
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}
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// Usage:
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is_odd(10); // Returns: false
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is_odd(11); // Returns: true
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```
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---
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title: Set ith bit
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description: Set the i-th bit of a number and returns the resulting number
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tags: bit-manipulation, number, set
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author: aelshinawy
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---
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```c
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int set_ith_bit(int n, int i) {
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return n | (1 << i);
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}
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// Usage:
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set_ith_bit(10, 0); // Returns: 11
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set_ith_bit(10, 2); // Returns: 14
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set_ith_bit(1, 8); // Returns: 257
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set_ith_bit(1, 3); // Returns: 9
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```
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---
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title: Swap Numbers
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description: Swap two numbers without a temporary variable
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tags: bit-manipulation, number, swap
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author: aelshinawy
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---
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```c
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void swap(int *a, int *b) {
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*a ^= *b;
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*b ^= *a;
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*a ^= *b;
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}
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// Usage:
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int x = 5, y = 10;
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swap(&x, &y);
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printf("x = %d, y = %d\n", x, y); // x = 10, y = 5
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```
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---
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title: Toggle ith bit
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description: Toggle the i-th bit of a number and returns the resulting number
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tags: bit-manipulation, number, toggle
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author: aelshinawy
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---
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```c
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int toggle_ith_bit(int n, int i) {
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return n ^ (1 << i);
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}
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// Usage:
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toggle_ith_bit(10, 0); // Returns: 11
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toggle_ith_bit(10, 1); // Returns: 8
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toggle_ith_bit(8, 1); // Returns: 10
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```

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