// main.cpp #include <iostream> #include <time.h> #include <cstdlib> using namespace std; extern "C" long vecsum (long*, long); // Purpose: This main program produces a vector of random numbers // between 0 and 99, then calls the externally defined function // 'vecsum' to add up the elements of the vector. // Originally written by Adam Ferrari, and updated by Aaron Bloomfield int main () { // delcare the local variables long n, *vec, sum; // how big is the array we want to use? cout << "Please enter a array size: "; cin >> n; // sanity check the array size if (n <= 0) { cerr << "Array size must be greater than zero.\n"; return 1; } // allocate the array vec = new long[n]; // use current time as random seed srand((unsigned) time(NULL)); // fill the array with random values for (long i = 0; i < n; ++i) { vec[i] = rand() % 100; cout << "\tvec[" << i << "] = " << vec[i] << endl; } // sum up the array and print out results sum = vecsum(vec, n); cout << "The sum of all array elements is " << sum << endl; // properly deallocate the array delete [] vec; // all done! return 0; }