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

Objective: Given an array of integers, in which every element occurs even a number of times except one number which occurs add a 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 an even number of times will be canceled out and the remaining elements will be the number which is appearing an odd number of times.

Code:


Element appearing add number of times: 5

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