ENGR201 - Sample c++ program for calculating SD using function

main.cpp

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <cmath>
using namespace std;

void myFunc1(int[], int);
double myFunc2(int[], int);
double myFunc3(int[], int, double);

int main() {
    
    int N=5,data[N] = {1,3,5,7,9};
    
    myFunc1(data,N);
    double x1 = myFunc2(data,N);
    double x2 = myFunc3(data,N,x1);
    
    printf("Avg: %.3f, SD: %.3f", x1, x2);
    
	return 0;
}

void myFunc1(int x[], int s) {
    for (int i=0; i<s; i++)
        cout << x[i] << " ";
    cout << endl;
}
    
double myFunc2(int x[], int s) {
    double sum=0;
    for (int i=0; i<s; i++)
        sum+=x[i];
    
    return sum/s;
}

double myFunc3(int x[], int s, double x_bar) {
    double sum_sqr=0;
    for (int i=0; i<s; i++)
        sum_sqr += pow(x[i]-x_bar, 2);
    
    return sqrt(sum_sqr/s);
}