Very Simple Function Example Program

/***********
Jim Engel

A very simple function example
     ****************/

#include <iostream>
#include <cstring>
using namespace std;

void  myFun ( int dage )
{  cout  << "In myFun, dage   =  " << dage << endl;
   dage =   13;
}

int main( )
{	int dogAge    = 3;
   cout << "Function demo program\n\n";

   myFun ( dogAge );

   cout  << "In main,  dogAge =  " << dogAge;
   cout << endl << "\n\nProgram Complete\n";
   return 0;
}
 		

A more complex example:

/***********
Jim Engel

A not quite so simple function example with pass by address
     ****************/

#include <iostream>
#include <cstring>
using namespace std;

void  myFun ( int dage, int *dpr, char *name )
{  cout  << "In myFun:\n   dage = " << dage << endl << endl;
   dage =   13;
   *dpr = 1200;
   strcpy ( name , "Spike");
}


int main( )
{	int dogAge      = 3;
   int dogPrice    = 900;
   char dogName[64] = "Rover";
   cout << "Function demo program\n\n";

   cout  << "Start in main:\n   dogAge   =    " << dogAge << "\n   dogPrice =  " << dogPrice << endl;
   cout  << "   dogName:  " << dogName << endl<< endl;

   myFun ( dogAge, &dogPrice,dogName );

   cout  << "Back in main:\n   dogAge   =    " << dogAge << "\n   dogPrice = " << dogPrice << endl;
   cout  << "   dogName:  " << dogName << endl;
   cout << endl << "\nProgram Complete\n";

   return 0;
}