1. Consider the following code:
import java.util.Scanner;
public class con {
public static void main(String[] args){
int a,b=2,c=5;
Scanner s = new Scanner(System.in);
a = s.nextInt();
b = a*c;
c = b/2 – c + 2;
System.out.print(a);
System.out.print(b);
System.out.println(c); }
Copyright © Curt Hill

2. Copyright © 2004-2018 - Curt Hill
Now what?
What is the first executable statement?
The declaration is first
Record the variables and their value
Then step through the statements
Copyright © Curt Hill

3. Copyright © 2004-2018 - Curt Hill
First step:
import java.util.Scanner;
public class con {
public static void main(String[] args){
int a,b=2,c=5;
Scanner s = new Scanner(System.in);
a = s.nextInt();
b = a*c;
c = b/2 – c + 2;
System.out.print(a);
System.out.print(b);
System.out.println(c); }
a b c ?
Copyright © Curt Hill

4. Copyright © 2004-2018 - Curt Hill
Second step:
import java.util.Scanner;
public class con {
public static void main(String[] args){
int a,b=2,c=5;
Scanner s = new Scanner(System.in);
a = s.nextInt();
b = a*c;
c = b/2 – c + 2;
System.out.print(a);
System.out.print(b);
System.out.println(c); }
a b c ?
Copyright © Curt Hill

5. Copyright © 2004-2018 - Curt Hill
Third step:
import java.util.Scanner;
public class con {
public static void main(String[] args){
int a,b=2,c=5;
Scanner s = new Scanner(System.in);
a = s.nextInt();
b = a*c;
c = b/2 – c + 2;
System.out.print(a);
System.out.print(b);
System.out.println(c); }
a b c ?
Assume input line is:
Copyright © Curt Hill

6. Copyright © 2004-2018 - Curt Hill
Fourth step:
import java.util.Scanner;
public class con {
public static void main(String[] args){
int a,b=2,c=5;
Scanner s = new Scanner(System.in);
a = s.nextInt();
b = a*c;
c = b/2 – c + 2;
System.out.print(a);
System.out.print(b);
System.out.println(c); }
a b c ?
Copyright © Curt Hill

7. Copyright © 2004-2018 - Curt Hill
Fifth step:
import java.util.Scanner;
public class con {
public static void main(String[] args){
int a,b=2,c=5;
Scanner s = new Scanner(System.in);
a = s.nextInt();
b = a*c;
c = b/2 – c + 2;
System.out.print(a);
System.out.print(b);
System.out.println(c); }
a b c ?
Copyright © Curt Hill

8. Copyright © 2004-2018 - Curt Hill
Sixth-Eighth step:
import java.util.Scanner;
public class con {
public static void main(String[] args){
int a,b=2,c=5;
Scanner s = new Scanner(System.in);
a = s.nextInt();
b = a*c;
c = b/2 – c + 2;
System.out.print(a);
System.out.print(b);
System.out.println(c); }
a b c ?
Copyright © Curt Hill