working without allocating memory for array

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My friend did this code. It works fine. aim was to separate every digit of number in to each element of array. But memory for a is not allocated anywhere. Any idea how this one is working?

    #include<iostream> 
    #include<math.h> 
    using namespace std; 

    int* arrray(int num, int *x){ 
        int len=0; 
        while(num!=0){ 
            x[len]=num%10; 
            num/=10; 
            len++; 
        }  
        return x; 
    } 
    int main(){ 
        int num1=123;  
        int l=0,k=0; 
        int *a=arrray(num1,a); 
        int n1[3]; 
        for(int i=2;i>=0;i--){ 
            n1[l]=a[i]; l++; 
        } 

    }

asked 2 mins ago

Ruturaj

57