Chapter 31 - Passing Variables to Your Functions created by s3f - https://repl.it/FH1x/11

Chapter 31 - Passing Variables to Your Functions.c

/*                              Passing Arguments

When you pass a variable from one function to another, you are passing an argument from the first function to the next. The recieving function recieevs the parameters from the function that sent the variables. 

                          Methods of Passing Arguments 
                          
The variables you want to pass go inside the parenthesis of the function call () and also in the recieving function. 

You pass arguments from function to function in 2 ways, by value and by address, 

                           Passing by Value
                           
Passing by value means that that the value of the variable is passed to the recieving function, not the variable itself. 

The following program below shows how to pass by value 


#include <stdio.h>

main()
{
  int i; 
  
  printf("Please enter an integer of your choosing... ");
  scanf(" %d", &i);
  
  // Now call the half function, passing the value
  
  half(i);
  // Shows that the function did not alter i's value 
  
  printf("In main(), is is still %d.\n", i);
  
  return (0);
  
}
  
                       ****************  
                      
 

half (int i) // Recieves the value of i 

{
  i = i /2; 
  printf("Your value halved is %d.\n", i);
  return; // Returns to main
}
*/

/*                        Passing by Address  

When pass an array to another function, the array is passed by address. The program below demostrates passing an array to a function. 
*/

#include <stdio.h>
#include <string.h>

main ()
{
  char name[10] = "Sef Sheek";
  change(name);
  
  printf("Back in main(), the name is now %s.\n", name);
  return (0); // Ends the program
}

                 /* *************************** */
 
 change(char name[10]) 
 {
   // Change the string stored at the address pointed to by name 
   
   strcpy(name, "XXXXXXXX");
   
   return; // Returns to main
 }