sizeof

//
// g++ t1.cpp
//
#include <iostream> 
using namespace std; 

main(){
  int i; 
  float x;
  double d; 
  char c; 

  cout << "sizeof( int) " << sizeof( int) << endl;
  cout << "sizeof( double) " << sizeof( double) << endl;
  cout << "sizeof( char) " << sizeof( char) << endl;
  cout << "sizeof( x) " << sizeof( x) << endl;
}