/*
   DemoDatatypes2.cpp
   CIS 150
   5/29/2008
   David Klick
   
   This program shows the range of the floating point data types.
   The output will differ depending on what compiler is used.   
*/

#include <iostream>
#include <cfloat>
using std::cin;
using std::cout;
using std::endl;

void cont();

int main(void) {
   // declare and initialize variables
   float minFloat = FLT_MIN;
   float maxFloat = FLT_MAX;
   double minDouble = DBL_MIN;
   double maxDouble = DBL_MAX;
   long double minLDouble = LDBL_MIN;
   long double maxLDouble = LDBL_MAX;
   
   // display internal sizes of data types
   cout << "A float is " << sizeof(float) << " bytes long\n";
   cout << "A double is " << sizeof(double) << " bytes long\n";
   cout << "A long double is " << sizeof(long double) << " bytes long\n";
   
   // display minimum and maximum values of datatypes
   cout << "float: " << minFloat << " through " << maxFloat << endl;
   cout << "double: " << minDouble << " through " << maxDouble << endl;
   cout << "long double: " << minLDouble << " through " << maxLDouble << endl;
   
   cont();
   return 0;
}

void cont() {
   if (cin.rdbuf()->sungetc() != -1 && cin.get() != '\n') cin.ignore(80,'\n');
   cout << "Press Enter to continue...";
   cin.get();
   return;
}

/*
   Note: This sample run was done with a compiler that
         clearly has a problem with long doubles.
   Sample output:
   
   A float is 4 bytes long
   A double is 8 bytes long
   A long double is 12 bytes long
   float: 1.17549e-038 through 3.40282e+038
   double: 2.22507e-308 through 1.79769e+308
   long double: 0 through 1.#INF
   Press Enter to continue...
*/