1.7 Review Exercises


Exercise 1.7

  1. What will this program print? 
    put "Here we are " ..
put "finally,"
put ""
put "at the end " ..
put "of" ..
put ""
put ""
put "Chapter 1"

  2. What will this program print? 
    put "To give the variable \"doubleQuote\"" ..
put " the value of a double quote,"
put "use the following assignment:"
put "doubleQuote := \"\\\"\""

  3. Classify each constant as being int, real, char, string, or illegal. If the constant is illegal, explain.
    1. "5.2e-3"
    2. -0
    3. '''
    4. "A string"
    1. '7'
    2. 37.
    3. .26E1
    4. 63.9E0.5

  4. Write without using E notation.
    1. 1E-3
    2. 6.35E0
    1. 0.007E-2
    2. 73.08E5

  5. State, with reasons, which of the following are illegal Turing identifiers.
    1. velocity
    2. firstValue
    3. 15March
    4. Get
    5. x27
    1. last-value
    2. case
    3. ending
    4. time.at.start
    5. time at end

  6. For each legal constant definition, state the type of the constant. If the definition is illegal, give a reason.
    1. STAR = "*"
    2. const PI = 0.314159e1
    3. const DATE := "October 31"
    1. const leastValue := -10000
    2. const SUM := 2 + 3
    3. const SCALE_FACTOR := -2.0E2.0

  7. Give two different statements that could be used to give a value to the int variable number.

  8. The program shown is full of errors. Copy the program and correct the mistakes. 
    Here's a comment
var a:= integer b:= real c:= char
const MAX : 50; MIN : 1
a = 75.6
put "Here is the integer, a
put "MAX = " MAX "MIN = " MIN
b := 7.2
put "Here is the "real"" b
c := *
put "And here's the char", c

    1. Rewrite the following program using the formatting style shown in this text. 
      const PI := 3.14159 var first,last:string get first get last put "Hi, mom, it's me ",first,last
put "Are we having ", PI, " for dessert tonight?"
    2. What would this program print given input of DAVID SKY?

  10. Write a program that draws a picture of a car.

  11. Draw a red square that is 100 x 100 at the bottom right corner. Draw a green circle that has a radius of 50 and just touches the top left corner of the screen. Draw a blue triangle with a black outline that goes through the following points: (150,150), (150, 250), (300, 200).