C programming

Question

#include <stdio.h>
int main() {
	int a[10];
	int i=0,j=0;
	int res1=0,res2=0;
	int res[10]={0};
	for(i=0;i<10;i++) {
		a[i] = i+1;
		for(j=0;j<10;j++) {
			if(i!=j) res[j] = res[j] ^ a[i]; 
		}
	}
		
	for(i=0;i<10;i++) {
		if(i&1) res2 = res2 ^ a[i];
		else res1 = res1 ^ a[i];
	}
	int sum=0;
	for(i=0;i<10;i++) sum += res1^res2^res[i];
	printf("%d\n",sum);

}

Output of the above program ?

Comments

answer is sum of first 10 natural numbers.

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what is ^ operator here..??AND operation??

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no XOR