Code for GAF.

#include "std_lib_cmpt125.h"

//////////////////////////////////////////////
//
// Global Variables
//
//////////////////////////////////////////////

vector<double> numbers;
double sum = 0;
double n1;
double smallest;
double largest;
double x;
const string prompt = "Enter one number: ";
string s1;

/////////////////////////////////////////////
//
// Helper Functions
//
/////////////////////////////////////////////

double find() {
  if((s1[s1.size()-1] == 'm' && s1[s1.size()-2] != 'c') ||
     (s1[s1.size()-2] == 'm' && s1[s1.size()-3] != 'c')) {
    istringstream iss(s1);
    iss >> x;
    n1 = x;
    return n1;
  } else if(s1[s1.size()-2] == 'c' || s1[s1.size()-3] == 'c') {
    istringstream iss(s1);
    iss >> x;
    n1 = x;
    n1 = (n1/100);
    return n1;
  } else if(s1[s1.size()-1] == 't' || s1[s1.size()-2] == 't') {
    istringstream iss(s1);
    iss >> x;
    n1 = x;
    n1 = (((n1*12)*2.54)/100);
    return n1;
  } else if(s1[s1.size()-1] == 'n' || s1[s1.size()-2] == 'n') {
    istringstream iss(s1);
    iss >> x;
    n1 = x;
    n1 = ((n1*2.54)/100);
    return n1;
  } else{
    error("That unit is not accepted.");
    return 0;
  }
}

double find_sum() {
  if(numbers.size() != 0) {
    for(unsigned int i = 0; i < numbers.size(); ++i) {
      sum = sum + numbers[i];
      return sum;
    }
  } else{
    error("You haven't entered any numbers.");
    return 0;
  }
}




//////////////////////////////////////////////
//
// Main Function
//
//////////////////////////////////////////////

int main() {
  cout << prompt;
  while(cin >> s1) {
    try{
      if(s1 == "|") {
    cout << "The smallest value is: " << smallest << endl;
    cout << "The largest value is: " << largest << endl;
    cout << "The number of values is: " << numbers.size() << endl;
    cout << "The sum of the values is: " << find_sum() << endl;
    return 0;
      } else{
    find();
    numbers.push_back(n1);
    sort(numbers.begin(), numbers.end());
    smallest = numbers[0];
    largest = numbers[numbers.size()-1];
    if(n1 == smallest) {
      cout << n1 << " the smallest so far. \n";
    } else if(n1 == largest){
      cout << n1 << " the largest so far. \n";
    } else{
      cout << n1 << endl;
    }
    cout << prompt;
      } //else
    } catch(runtime_error e) {
      cout << e.what() << endl;
      cout << prompt;
    } //while
  }
}