/*************************************************\
* trace.c *
* This program illustrates local variables and is *
* to be used to demonstrate the techniques of *
* tracing a program by hand. *
\*************************************************/
#include <stdio.h>
int Foobar (int a);
int Geez (int b);
main ()
{
int a = 1, b = 2, c = 3;
c = Geez (a);
b = Foobar(c);
printf("main: a = %d, b = %d, c = %d\n",
a, b, c) ;
}
/* Foobar is used to illustrate tracing code */
int Foobar (int b)
{
int a, c;
a = Geez (b);
c = b++;
printf("Foobar: a = %d, b = %d, c = %d\n",
a, b, c);
return (c);
}
/* Geez is used to illustrate tracing code */
int Geez (int c)
{
int a, b;
a = c + 100;
b = 2 * a;
printf("Geez: a = %d, b = %d, c = %d\n",
a, b, c);
return (a);
}
The Sample Run
Geez: a = 101, b = 202, c = 1
Geez: a = 201, b = 402, c = 101
Foobar: a = 201, b = 102, c = 101
main: a = 1, b = 101, c = 101