Function and Array in C++: Unexpected output -

i need here please.

i started learning c++ (coming python background).

i'm trying familiarize myself arrays , functions. wrote bunch of functions stated, above each one.

however, function supposed sum elements in array , return sum, seem adding 10 result, no matter argument supplied input. doing wrong please, can't seem find out. on general layout of code appreciated.

// working arrays , functions  #include<iostream>  using namespace std;  // function instantiate array int of length n. int* array_creator(int n) {     static int ary_of_ten[10];  //declare array     (int i=0; i<n; i++)   //use loop fill     {         ary_of_ten[i] = i+1;     }     return ary_of_ten; }  //function print array elements void* array_printer(int arr[], int array_lenght) {     (int i=0; i<array_lenght-1; i++)     {         cout << arr[i] << " ";     }     cout << arr[array_lenght-1] << endl; }  //function accepts int arrays , returns array of square of each element int* square_array(int *p, int array_length) {     const int ary_sz(array_length);     static int sqd_values[10];     (int i=0; i<ary_sz; i++)     {         *(sqd_values + i) = *(p+i) * *(p+i);     }     return sqd_values; }  //function accepts int arrays , returns sum of elements int sum_array(int *arry, int array_length) {     int summation;     for(int i=0; i<array_length; i++)     {         summation += *(arry + i);     }     return summation; }  int main() {     cout << sum_array(array_creator(10), 3) << endl;     array_printer(array_creator(10), 10);           //print array of 1-10 elements     array_printer(square_array(array_creator(10), 10), 10);     //prt arry of sqrd values     return 0; } 

summation shuld initialized 0.

int summation=0;