wrong.cpp

wrong.cpp

#include <iostream>
#include <vector>

double average(const std::vector<int>& v) {
    double a;
    size_t N = v.size();
    for (size_t i = 0; i <= N; i++) {
        int b = v[i];
        a += b / N;
    }
    return a;
}

int main() {
    // print multiples of 1/3 and their squares
    double x = 0.0;
    while (x != 6.0) {
        std::cout << x << "\t" << x*x << std::endl;
        x += 1./3;
    }

    // calculate the average over a bunch of numbers
    std::vector<int> numbers = {3, 1, 4, 1, 5, 9, 2, 6, 5, 3}; // needs C++11!
    double avg = average(numbers);
    std::cout << avg << std::endl;

    return 0;
}