something wrong with the idea of creating a struct - how to fix it?
Hi,
Below is the first exercise on struct that I did. I have a feeling that I didn't get an idea behind the struct. Looking at the program I wrote, I am wondering what is the benefit of writing this program using struct. I could have write 5 functions for mean, median, smallest, largest, and call each of them when printing the results. The exercise asks me to create a struct, so it must imply that there's some benefit from using struct. I'm suspecting that I didn't get the idea... Could you please suggest some improvement? Thanks a lot...
Code:
// Exercise 8.12
#include "std_lib_facilities.h"
/*
Write a function that finds the smallest & the largest element of a vector
argument and also compute the mean and the median. Do not use global variables.
Either return a struct containing results or pass them back through reference
arguments. Which of the 2 ways of returning several result values do you prefer and why?
*/
struct stats {
vector<double> v;
double smallest, largest, median;
double fmean(vector<double>& v);
double fmedian(vector<double>& v);
double fsmallest(vector<double>& v);
double flargest(vector<double>& v);
};
int main()
try {
stats mystats;
vector<double> v;
double x;
cout << "Enter some elements for a vector: \n";
while (cin >> x)
v.push_back(x);
cout << "Here are some summary statistics: \n";
cout << "Smallest: " << mystats.fsmallest(v) << '\n';
cout << "Largest: " << mystats.flargest(v) << '\n';
cout << "Mean: " << mystats.fmean(v) << '\n';
cout << "Median: " << mystats.fmedian(v) << '\n';
}
catch (runtime_error e) {
cout << e.what();
}
double stats::fsmallest(vector<double>& v)
{
smallest = v[0];
for (unsigned int i = 0; i < v.size(); ++i) {
if (v[i] < smallest)
smallest = v[i];
}
return smallest;
}
double stats::flargest(vector<double>& v)
{
largest = v[0];
for (unsigned int i = 0; i < v.size(); ++i) {
if (v[i] > largest)
largest = v[i];
}
return largest;
}
double stats::fmean(vector<double>& v)
{
double sum = 0;
for (unsigned int i = 0; i < v.size(); ++i) {
sum += v[i];
}
return sum / v.size();
}
double stats:: fmedian(vector<double>& v)
{
sort(v.begin(), v.end());
median = 0;
for (unsigned int i = 0; i < v.size(); ++i) {
if (v.size()%2==0)
median = (v[v.size()/2] + v[v.size()/2-1])/2;
else
median = v[v.size()/2];
}
return median;
}