C++定义数字

#include <iostream>

using namespace std;

int main () {
   // number deFinition:
   short  s;
   int    i;
   long   l;
   float  f;
   double d;

   // number assignments;
   s = 10;      
   i = 1000;    
   l = 1000000; 
   f = 230.47;  
   d = 30949.374;

   // number printing;
   cout << "short  s :" << s << endl;
   cout << "int    i :" << i << endl;
   cout << "long   l :" << l << endl;
   cout << "float  f :" << f << endl;
   cout << "double d :" << d << endl;

   return 0;
}