Given a positive (or unsigned) integer n, write a function to toggle all the bits except k-th bit. Here value of k starts from 0 (zero) and from right.
Examples:
Input : n = 4294967295, k = 0 Output : 1 The number 4294967295 in 32 bits has all bits set. When we toggle all bits except last bit, we get 1. Input : n = 1, k = 1 Output : 4294967292 4294967262 has all bits toggled except second bit from right.
- Toggle bit at k-th position. We do it by finding a number with only k-th bit set (using 1 << k), then doing bitwise XOR of this number n.
- Toggle all bits of number obtained above using ~ (Bitwise negation)
// C program to toggle all bits except kth bit #include<stdio.h> // Returns a number with all bit toggled in n // except k-th bit unsigned int toggleAllExceptK(unsigned int n, unsigned int k) { /* 1) Toggle k-th bit by doing n ^ (1 << k) 2) Toggle all bits of the modified number */ return ~(n ^ (1 << k)); } // Driver code int main() { unsigned int n = 4294967295; unsigned int k = 0; printf("%u", toggleAllExceptK( n, k)); return 0; } |
Output:
1
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