C Exercises: Find two numbers that occur odd number of times in an array
C Array: Exercise-70 with Solution
Write a program in C to find two numbers that occur an odd number of times in an array.
Pictorial Presentation:

Sample Solution:
C Code:
#include <stdio.h>
void TwoNumberOddOccure(int arr1[], int arr_size)
{
int xor2 = arr1[0];
int setbitno;
int i;
int n = arr_size - 2;
int num1 = 0, num2 = 0;
for(i = 1; i < arr_size; i++)
xor2 = xor2 ^ arr1[i];
setbitno = xor2 & ~(xor2-1);
for(i = 0; i < arr_size; i++)
{
if(arr1[i] & setbitno)
num1 = num1 ^ arr1[i];
else
num2 = num2 ^ arr1[i];
}
printf("The two numbers occuring odd number of times are: %d & %d ", num1, num2);
}
int main()
{
int arr1[] = {6, 7, 3, 6, 8, 7, 6, 8, 3, 3};
int arr_size = sizeof(arr1)/sizeof(arr1[0]);
int i;
//------------- print original array ------------------
printf("The given array is : ");
for(i = 0; i < arr_size; i++)
{
printf("%d ", arr1[i]);
}
printf("\n");
//------------------------------------------------------
TwoNumberOddOccure(arr1, arr_size);
return 0;
}
Sample Output:
The given array is : 6 7 3 6 8 7 6 8 3 3 The two numbers occuring odd number of times are: 3 & 6
Flowchart:

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Previous: Write a program in C to find out the maximum difference between any two elements such that larger element appears after the smaller number.
Next: Write a program in C to find the median of two sorted arrays of different size.
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C Programming: Tips of the Day
C Programming - What is the argument for printf that formats a long?
Put an l (lowercased letter L) directly before the specifier.
unsigned long n; long m; printf("%lu %ld", n, m);
Ref : https://bit.ly/3dIwfkP
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