[Solved] CSE465/565 -Homework 1-create a Java file and copy the commands

10/10) create the following Java file Sample.java .

import java.util.*; public class Sample {

public static void main(String [] args) {

Scanner input = new Scanner(System.in);

String user = System.getProperty(user.name); System.out.println(user); int printed = 0;

while (input.hasNext() && printed < 10) { String line = input.nextLine(); if (line.indexOf(inclezd) == 0 || line.indexOf(user) == 0) { System.out.println(line); printed++;

} } input.close();

} } Compile and run the program with the following commands:

javac Sample.java last | java Sample

Copy the commands exactly as you see them above: last is a command that shows information about the last logged in users. Insert the programs output into your PDF.

(3). (85/85) Consider a very simple programming language named Z+-. The Z+- programming language has the following features:

• Z+- variables can store a string or integer value. A single variable can switch between integer and string values during program execution. Assigning a value to a variable creates that variable for future use. A runtime error occurs if a variable is used before it is given a value.
• Variables are case sensitive and consist only of upper and lower-case letters.
• The following are Z+- reserved words: PRINT, FOR, ENDFOR, PROC, ENDPROC, CALL You may assume that the Z+- program is syntactically correct.
• The PRINT statement displays one particular variables value. This is done as:

PRINT numCookies ;

• The right-hand side of a simple assignment statement (i.e., =) is either a variable name (which must have a value), signed integer, or string literal. For example, the following are valid:

• = 12 ;

A = B ;

A = hello ;

• There are three compound assignment statements: +=, *=, and -=. The meaning of these operators depends on the data type of the left and right hand side of the operator.

<string var> += <string> concat right string onto end of left string

<integer var> += <integer> increment left integer with value on right

<integer var> *= <integer> multiply left integer by value on right

<integer var> -= <integer> subtract right integer from value on left

• += 34 ;

A *= B ;

A += hello world ;

All other combinations are illegal and cause a runtime error.

• Every statement is terminated by a semi-colon.
• There is a loop statement FOR whose body contains at least one simple statement (i.e., at least one assignment), which are presented on one line. The keyword FOR is followed by an integer constant, which indicates the number of times to execute the loop. Following this number is a sequence of statements defining the loops body, followed by the word ENDFOR, as done here:

FOR 5 B += A ; A *= 2 ; ENDFOR

• Z+- for loops can be nested and must appear on one line:

FOR 5 B += A ; A *= 2 ; FOR 10 A += B ; ENDFOR A += 2 ; ENDFOR

• Z+- programs must have at least one space separating all lexical elements.
• Here is an example Z+- program:

• = 1 ;
• = 0 ;

FOR 5 B += A ; A *= 2 ; ENDFOR

A += 1000 ;

PRINT A ;

PRINT B ;

This programs output is:

A=1032

B=31

As an example, an equivalent Python program would be (Do not translate Z+- code into Python!):

• = 1 B = 0 for i in range(5):
• += A

A *= 2

A += 1000 print(A= + str(A)) print(B= + str(B))

Here is a second Z+- program:

A = 10 ;

A += A ;

PRINT A ;

A = hello ;

A += A ;

PRINT A ;

A += 123 ;

PRINT A

The output to this second program would yield an error. Your program should display the line number of this error and then stop processing:

A=20

A=hellohello

RUNTIME ERROR: line 7