Lecture 5 Objectives

KNOW:

• What happens in memory when an argument is passed by value

BE ABLE TO:

• Develop a complete C function definition (function heading and function body) from the description of a function
• Trace through the execution of a program that contains one or more function calls

Sample Exam Question:

What will be displayed when the following program executes?

#include <stdio.h>

void changeVars (int x, int y);

int main()
{
  int a=4, b=5;
  printf ("a = %d, b = %d\n", a, b);
  changeVars (a,b);
  printf ("a = %d, b = %d\n", a, b);
  return 0;
}

void changeVars (int x, int y)
{
  x = 10;
  y = 20;
  printf ("x = %d, y = %d\n", x, y);
  return;
}