Toggling k-th bit of a number
For a given number n, if k-th bit is 0, then toggle it to 1 and if it is 1 then, toggle it to 0.
Input : n = 5, k = 1 Output : 4 5 is represented as 101 in binary and has its first bit 1, so toggling it will result in 100 i.e. 4. Input : n = 2, k = 3 Output : 6 Input : n = 75, k = 4 Output : 67
Below are simple steps to find the value of k-th bit
1) Left shift given number 1 by k-1 to create a number that has only set bit as k-th bit. temp = 1 << (k-1) 2) Return bitwise XOR of temp and n. Since temp has only k-th bit set, doing XOR would toggle only this bit.
n = 75 and k = 4 temp = 1 << (k-1) = 1 << 3 = 8 Binary Representation of temp = 0..00001000 Binary Representation of n = 0..01001011 Bitwise XOR of two numbers = 0..01000011
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