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Submitted by idefix on Tue, 12/10/2010 - 13:29
Code: 
#include <stdio.h>
 
/* programm to see who a pointer work with functions
   Written by Matthias Fechner
*/
 
void callByValue(int);
void callByReference(int*);
 
int main(void)
{
   int i;
 
   i=1;
   printf("i=%d\n",i);
   callByValue(i);
   printf("i=%d\n",i);
 
   callByReference(&i);
   printf("i=%d\n",i);
 
   return 1;
}
 
void callByValue(int i)
{
   printf("i=%d\n",i);
   i=8;
   printf("i=%d\n",i);
   return;
}
 
void callByReference(int *i)
{
   printf("i=%d\n",*i);
   *i=13;
   printf("i=%d\n",*i);
   return;
}
Result: 
~/c_tutor> gcc pointer_func.c                                                                         idefix@idefix_mobil
~/c_tutor> ./a.out                                                                                    idefix@idefix_mobil
i=1
i=1
i=8
i=1
i=1
i=13
i=13
Source File: 
File pointer_func.c
Output: 
Plain text icon pointer_func_ausgabe.txt