#include <stdio.h>
#include <stdlib.h>


// compare this to the foo function of example6.cpp.
// Here, the argument is a single pointer, not a double pointer.
void foo(char * b)
{
  b = (char *) malloc(sizeof(char) * 6);
  b[0] = 'h';
  b[1] = 'e';
  b[2] = 'l';
  b[3] = 'l';
  b[4] = 'o';
  b[5] = 0;
}


int main()
{
  char * a = "john";
  printf("before calling foo:\n");
  printf("a = %s\n\n", a);
  foo(a);

  // note that, in contrast to example6.cpp, the value of a
  // is NOT different after calling the foo function
  printf("after calling foo:\n");
  printf("a = %s\n", a);
}