// Sample of functions in expressions
#include <iostream.h>
int f2(int);
int f1(int);
void main()
{ int i1, i2 ,i3, i4;
  i1=f1(3);
  i2=f2(i1);
  i3=f1(i2);
  i4=f2(i3);
  cout<< i4 << " = ";
  cout << f2( f1( f2( f1( 3 )))) << endl;
}
int f1(int i)
{ cout << endl << "debug: f1 called with i=" << i<<endl;
  return i+1;
}
int f2(int i)
{ cout << endl << "debug: f2 called with i=" << i<<endl;
  return 2*i;
}