Answer to Question #300884 in C++ for Kelly

Question

How to execute this using vector

#include <cmath>

#include <iostream>

const short int SIZE = 10;

double mean(const double x[], int size);

// Compute the deviation of double values

double deviation(const double x[], int size);

int main() {

double myarray[SIZE];

std::cout << "Enter the number: ";

for (int index = 0; index < SIZE; index++)

std::cin >> myarray[index];

std::cout << "The mean is " << mean(myarray, SIZE) << ".\n";

std::cout << "The standard deviation is " << deviation(myarray, SIZE)

<< ".\n";

return 0;

}

double mean(const double x[], int size) {

double total = 0;

for (int index = 0; index < size; index++)

total += x[index];

return total / size;

}

double deviation(const double x[], int size) {

double themean = mean(x, size);

double total = 0;

for (int index = 0; index < size; index++) {

total += pow(x[index] - themean, 2);

}

return sqrt(total / size - 1);

}

Answer 1

#include <cmath>
#include <iostream>

const short int SIZE = 10;

double mean(const vector<double> x, int size);
double deviation(const vector<double> x, int size);

int main() {
  vector<double> myvec(SIZE);
  std::cout << "Enter the number: ";
  for (int index = 0; index < SIZE; index++) {
    std::cin >> myvec[index];
  }
  std::cout << "The mean is " << mean(myvec, SIZE) << ".\n";
  std::cout << "The standard deviation is " << deviation(myvec, SIZE)
            << ".\n";
  return 0;
}
double mean(const vector<double> x, int size) {
  double total = 0;
  for (int index = 0; index < size; index++) {
    total += x[index];
  }
  return total / size;
}
double deviation(const vector<double> x, int size) {
  double themean = mean(x, size);
  double total = 0;
  for (int index = 0; index < size; index++) {
    total += pow(x[index] - themean, 2);
  }
  return sqrt(total / size - 1);
}