[Dev-C++] programming style

[Ioannis V. <no...@ho...>]

I have made a small proggy to assist me to some lottery calculations, it
provides basic statistics. It shows nicely some of the benefits of C++
as a high level programming language, so i decided to post a stripped
down version to the list (in terms of complexity for speed optimization
and bullet-proofness, the results remain the same). Remember, C++ must
be dealt as a high level language, and use low level features only when
you can't do otherwise. This is often missed from the majority of C++
books (mainly written by C coders), mainly because it was very recently
standardised:
 
 
#include <iostream>
#include <vector>
 
int main()
{
 using namespace std;
 
 // Ou array where the appearrances of the numbers are recorded
 vector<int>stats;
 
 unsigned input;
 
 // cin returns true or false when in a boolean expression
 // It returns false when it finds EOF.
 while(cin>>input)
 {
   // The array increases as much as it is required. No overlfows.
   if(input>stats.size())
     stats.resize(input); // Behavior equivallent to C's realloc()
     
   stats[input-1]++;
 }
 
 system("cls");
 
 cout<<endl;
 
 int max=stats[0], min=stats[0];
 float sum=0;
 
 // As you see the code is bullet proof, whatever the size becomes
 // the code adjusts itself. The size is determined in one place, and
the code
 // doesn't depend on a specific number.
 for(unsigned long i=0; i<stats.size(); i++)
 {
   cout<<i+1<<": "<<stats[i]<<"\t";
 
   if(max<stats[i])
     max=stats[i];
     
   else if(min>stats[i])
          min=stats[i];
          
   sum+=stats[i];
 
   if(!(i%9))
    cout<<endl;
 }
 
  cout<<endl<<endl;
 
 cout<<"Maximum appearances: "<<max<<", Minimum appearances:
"<<min<<endl;
 cout<<"Average appearances: "<<sum/stats.size()<<", Total appearances:
"<<sum;
 cout<<endl;
 
 // Array object is destroyed. Its elements destructors are called.
 // No explicit memory allocation/deallocation, so no possibility for
memory
 // leaks & bugs. ==> Bullet proof code.
 
}
 
 
Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
<http://www.noicys.cjb.net/> 
* Alternative URL: http://run.to/noicys