Zeiger allgemein

#include <stdio.h>

/* programm to see who a pointer works
Written by Matthias Fechner
*/

int main(void) {
    int i,*ptr;
    
    i=3;
    ptr=&i;
    
    printf("i=%d\n",i);
    printf("ptr=0x%X\n",ptr);
    printf("*ptr=%d\n",*ptr);
    
    i=5;
    printf("i=%d\n",i);
    printf("ptr=0x%X\n",ptr);
    printf("*ptr=%d\n",*ptr);
    
    *ptr=8;
    printf("i=%d\n",i);
    
    return 1;
}

~/c_tutor> gcc pointer.c                                                                              idefix@idefix_mobil
~/c_tutor> ./a.out                                                                                    idefix@idefix_mobil
i=3
ptr=0xBFFFF8E4
*ptr=3
i=5
ptr=0xBFFFF8E4
*ptr=5
i=8