Zeiger bei Funktionsaufruf

#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;
}

~/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