#include <iostream>
int IntArrayToIntNumber(int arr[], int size) {
int n = 0;
for (int i = 0; i < size; i++) {
n = n * 10 + arr[i];
}
return n;
}
int main() {
int arr[] = {4, 6, 3, 9, 1, 2};
int size = sizeof(arr)/sizeof(arr[0]);
std::cout << IntArrayToIntNumber(arr, size);
}
/*
run:
463912
*/