Script started on Wed Oct  8 17:29:10 2025
macbook:logs> cd ../programs/C_ch11
macbook:C_ch11> echo attendance code: 1979
attendance code: 1979
macbook:C_ch11> ls *java
zsh: no matches found: *java
macbook:C_ch11> cd
macbook:~> cd ~/Desktop/csc3320_Fall2025/programs/C_ch11
macbook:C_ch11> pwd
/Users/mweeks/Desktop/csc3320_Fall2025/programs/C_ch11
macbook:C_ch11> ls *java                                     
Person.java
macbook:C_ch11> cat Person.java 
class Person{
  public int age=0;
  Person(int _age){
    this.age=_age;
  }
  public static void main(String[] args){
    Person p1=new Person(22);
    Person p2=new Person(21);
    p2=p1;
    p1.age=25; // p1’s age now 25
    System.out.println(p1.age+" "+p2.age);
  }
}
macbook:C_ch11> javac Person.java
macbook:C_ch11> java Person.class
Error: Could not find or load main class Person.class
Caused by: java.lang.ClassNotFoundException: Person.class
macbook:C_ch11> java Person      
25 25
macbook:C_ch11> cp Person.java Person_v2.java
macbook:C_ch11> vi Person_v2.java 
macbook:C_ch11> javac Person_v2.java 
macbook:C_ch11> java Person_v2
Error: Could not find or load main class Person_v2
Caused by: java.lang.ClassNotFoundException: Person_v2
macbook:C_ch11> vi Person_v2.java   
macbook:C_ch11> javac Person_v2.java
Person_v2.java:3: error: invalid method declaration; return type required
  Person(int _age){
  ^
1 error
macbook:C_ch11> vi Person_v2.java   
macbook:C_ch11> javac Person_v2.java
macbook:C_ch11> cat Person_v2.java 
class Person_v2 {
  public int age=0;
  Person_v2(int _age){
    this.age=_age;
  }
  public static void main(String[] args){
    Person_v2 p1=new Person_v2(22);
    Person_v2 p2=new Person_v2(21);
    p2=p1;
    p1.age=25; // p1’s age now 25
    p2.age = 24; 
    System.out.println(p1.age+" "+p2.age);
  }
}
macbook:C_ch11> java Person_v2
24 24
macbook:C_ch11> cat dont_do_this.c 
#include <stdio.h>

int main() {

  int *p;
  printf("%d\n", *p);

  return 0;
}
macbook:C_ch11> gcc dont_do_this.c 
macbook:C_ch11> ./a.out
49679200
macbook:C_ch11> echo a = b;  b=a; does not work
a = b
zsh: command not found: does
macbook:C_ch11> echo "a = b;  b=a; does not work"
a = b;  b=a; does not work
macbook:C_ch11> exit

Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.
Deleting expired sessions...       4 completed.

Script done on Wed Oct  8 18:45:04 2025