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Pass array in a function in C++

Write a program to initialize value into 1-D array. Pass the array as argument to a function and
compute the sum of array. The function should return the calculate sum to the calling function.

#include <iostream>
using namespace std;

inline int sum(int One_d[], int size);

int main()
int One_d[] = {4,2,1};
cout<<"SUM: " << sum(One_d,3) << endl;

return 0;

inline int sum(int One_d[], int size)
return  One_d[0] + One_d[1] + One_d[2];
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