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- #include <iostream>
- #include <fstream>
- #include <iomanip>
- #include <vector>
- #include <cmath>
- using namespace std;
- double mean(vector <double> vec) {
- double sum = 0;
- for (size_t i = 0; i < vec.size(); i++) {
- sum += vec[i];
- }
- return sum / vec.size();
- }
- double read_vector(vector <double>& vec, char* filename) {
- ifstream input(filename);
- vec.clear();
- double x;
- while (input >> x) {
- vec.push_back(x);
- }
- }
- int main(int argc, char **argv) {
- if (argc != 2) {
- cout << "Usage: mean <filename>" << endl;
- return 1;
- }
- vector <double> vec;
- read_vector(vec, argv[1]);
- if (vec.empty()) {
- cout << "File should be non-empty!" << endl;
- return 1;
- }
- cout << setprecision(6) << fixed;
- cout << mean(vec);
- return 0;
- }
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