// main.cpp #include <iostream> #include <time.h> #include <cstdlib> using namespace std; extern "C" int vecsum (int *, int); // 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. // Author: Adam Ferrari int main () { int n, *vec, sum; cout << "Please enter a vector size: "; cin >> n; // sanity check the vector size if (n <= 0) { cerr << "Vector size must be greater than zero.\n"; return 1; } // allocate, initialize, and display vector vec = new int[n]; // use current time as random seed srand((unsigned) time(NULL)); for (int i = 0; i < n; ++i) { vec[i] = rand() % 100; cout << "\tvec[" << i << "] = " << vec[i] << endl; } // sum up the vector and print out results sum = vecsum(vec, n); cout << "The sum of all vector elements is " << sum << endl; return 0; }