Find a Number occurring odd number of times in a Given array

Objective: Given a array of integers, in which every elements occurs even number of times except one number which occurs add number of times. Find out that number.

Example:

  int[] A = { 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 7 };
Element appearing add number of times: 5

Approach:

we know that A XOR A = 0 so numbers appearing even number of times will be cancelled out and remaining element will the number which is appearing odd number of times.

Code:

Output:

Element appearing add number of times: 5
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