C语言实现整数同或运算

按位进行整数的同或运算：
输入 int a ，b；
输出 int res；

int xnor(int a, int b) {
	int res = 0;
	int arr1[32] = { 0 };
	int arr2[32] = { 0 };
	for (int i = 0; i < 32; i++) {
		arr1[i] = a % 2;
		arr2[i] = b % 2;
		a = a / 2;
		b = b / 2;
	}
	int m = 0;
	for (int i = 31; i >= 0; i--) {
		if (arr1[i] == 1 || arr2[i] == 1) {
			m = i + 1;
			break;
		}
	}
	int *arr3 = new int[m];
	for (int i = 0; i < m; i++) {
		if (arr1[i] == arr2[i]) arr3[i] = 1;
		else arr3[i] = 0;
		res = res + arr3[i] * pow(2, i);
	}
	return res;
}