Script started on Wed Oct 29 17:29:21 2025
Restored session: Wed Oct 22 18:46:04 EDT 2025
%                                                                 macbook:logs> cd ../programs/C_ch16
%                                                                 macbook:C_ch16> echo attendance code 4178
attendance code 4178
%                                                                 macbook:C_ch16> cat C_ch16_8_v4.c 
// Show the sizes of the union vs struct
#include <stdio.h>

int main() {

    union {
        int i;
        float f;
        char c;
        double val;
        long L_val;
    } u;

    struct {
        int i;
        float f;
        char c;
        double val;
        long L_val;
    } s;

/*
  s.i = 23;
  printf("s.i is %d \n", s.i);
  s.f = 4.756;
  printf("s.f is %f \n", s.f);

  u.i = 23;
  printf("u.i is %d \n", u.i);
  printf("u.i is %x in hex\n", u.i);
  u.f = 4.756;
  printf("u.f is %f \n", u.f);

  printf("Final values:\n");
  printf("s.i is %d \n", s.i);
  printf("s.f is %f \n", s.f);
  printf("u.i is %d \n", u.i);
  printf("u.i is %x in hex\n", u.i);
  printf("u.f is %f \n", u.f);
*/

  printf("Size of struct s is %lu\n", sizeof(s));
  printf("Size of union u is %lu\n", sizeof(u));

  return 0;
}
%                                                                 macbook:C_ch16> gcc C_ch16_8_v4.c 
%                                                                 macbook:C_ch16> ./a.out
Size of struct s is 32
Size of union u is 8
%                                                                 macbook:C_ch16> 
%                                                                 macbook:C_ch16> vi question_about_losing_ptr
%                                                                 macbook:C_ch16> cat question_about_losing_ptr 

char *p;

..
p = malloc(N+1);

..

char a = 'A';
p = &a;


free(p);  // will not work

%                                                                 macbook:C_ch16> ls getMostFreq*
zsh: no matches found: getMostFreq*
%                                                                 macbook:C_ch16> cd ../C_ch17
%                                                                 macbook:C_ch17> ls getMostFreq*
zsh: no matches found: getMostFreq*
%                                                                 macbook:C_ch17> grep supplied *.c
C_ch17_8.c:    printf("The argument supplied is %s\n", argv[1]); 
C_ch17_8.c:    printf("Too many arguments supplied.\n"); 
%                                                                 macbook:C_ch17> cat C_ch17_8.c
#include <stdio.h> 

int main( int argc, char *argv[] ) { 
  printf("Program name %s\n", argv[0]); 
  if ( argc == 2 ) { 
    printf("The argument supplied is %s\n", argv[1]); 
  } 
  else if ( argc > 2 ) { 
    printf("Too many arguments supplied.\n"); 
  } 
  return 0;
} 
%                                                                 macbook:C_ch17> gcc C_ch17_8.c 
%                                                                 macbook:C_ch17> ./a.out
Program name ./a.out
%                                                                 macbook:C_ch17> ./a.out apple
Program name ./a.out
The argument supplied is apple
%                                                                 macbook:C_ch17> ./a.out apple orange
Program name ./a.out
Too many arguments supplied.
%                                                                 macbook:C_ch17> which vi
/usr/bin/vi
%                                                                 macbook:C_ch17> which nano
/usr/bin/nano
%                                                                 macbook:C_ch17> which pico
/usr/bin/pico
%                                                                 macbook:C_ch17> which emacs
emacs not found
%                                                                 macbook:C_ch17> ls -l /usr/bin/nano
lrwxr-xr-x  1 root  wheel  4 Aug 16 14:44 /usr/bin/nano -> pico
%                                                                 macbook:C_ch17> echo "suppose your program says   p = malloc(100);should your program do?"
suppose your program says   p = malloc(100);    what else should your program do?
%                                                                 macbook:C_ch17> exit

Saving session...
...saving history...truncating history files...
...completed.

Script done on Wed Oct 29 18:52:59 2025