## Tutorials - XOR Challenge## Solution to XOR Variable SwappingSo you have two variables, a and b; we'll assign a to be 5, and b to be 10. We want to store the value of a in b, and the value of b in a, but without using a temporary variable.int a, b; a = 5; b = 10;We can do this using bitwise XOR remembering the principle that two applications of XOR to a variable will "cancel out". Here's a function that will take pointers to two variables and flip them. For clarity, I'll refer to the original values stored in a and b as a_orig and b_orig. Originally, *a and *b will be a_orig and b_orig, but this will change over time. void flip(int *a, int *b) { *a = *a ^ *b; // Now, we can recover *a_orig by applying *a XOR *b_orig *b = *a ^ *b; // So we have the following situation: // The value originally stored in *a, a_orig, is now in *b // and *a still stores a_orig ^ b_orig // This means that we can recover the value of b_orig by applying // the XOR operation to *a and a_orig. Since *b stores a_orig... *a = *a ^ *b } |