int or double?

[atjm88]

Hi, my code below can function with int or double, so may I know any different between them?

#include <iostream>
#include <conio>

int main ()
{
	int mark;

   cout<<"Enter your mark>>";
   cin>>mark;

   if (mark>=75)
     	cout<<"Your Score: A"<<endl;

	if  ((mark<75) && (mark>=60))
   	cout<<"Your Score: B"<<endl;

   if  ((mark<60) && (mark>=45))
      cout<<"Your Score: C"<<endl;

   if  ((mark<45) && (mark>=30))
      cout<<"Your Score: D"<<endl;

   if  (mark<30)
      cout<<"Your Score: E"<<endl;

   getch();
   return 0;
}

[clanmjc]

so may I know any different between them?

What are you asking, should you know the difference between and int or a double? It can function with either because it is implicitly converting any double/float value you enter to an int.

[atjm88]

I not really understand about int, double, word, and long, can u briefly explain it with a simple example? really thanks for the answer^^