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haas:spring2017:cprog:pointer_fun1

Pointers1

#include <stdio.h>
#include <stdlib.h>
 
int main()
{
    char a, *b;
 
    a = 'a'; // what numeric value is being stored in the variable a? Why?
    b = &a;
 
    printf("a contains     '%c'\n", a);
    printf("a's address is 0x%X\n", &a);
    printf("-----------------------\n");
    printf("b dereferenced contains '%c'\n", *b);
    printf("b contains     0x%X\n", b);
    printf("b's address is 0x%X\n", &b);
 
    return(0);
}

Questions

  • What do the variables a and b have in common?
  • Where do they differ?
  • If you change variable a, what will happen to b?
  • If you change variable b, will it impact a?
  • How can you change b without breaking things?
haas/spring2017/cprog/pointer_fun1.txt · Last modified: 2013/02/06 16:24 by 127.0.0.1