Initial Commit

Author: FrankieLaw

Examples/Chapter2_Examples/fig02_01.py

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+# Fig. 2.1: fig02_01.py
+# Text printing program
+
+print( "Welcome to Python!!\n" )    # Print a message on the screen

Examples/Chapter2_Examples/fig02_03.py

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+# Fig. 2.1: fig02_03.py
+# Printing a line of text with mulitple statements.
+
+print( "Welcome " )
+print( "to Python!\n" )

Examples/Chapter2_Examples/fig02_04.py

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+# Fig. 2.4: fig02_04.cpp
+# Printing multiple lines of text with a single statement.
+
+print( "Welcome\nto\n\nC++!\n" )

Examples/Chapter2_Examples/fig02_05.py

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+# Fig. 2.5: fig02_05.cpp
+# Addition program that displays the sum of two integers.
+
+# MAIN ==================================
+# function main begins program execution
+# =======================================
+
+# variable declarations
+number1:int;                # first integer to add
+number2:int;                # second integer to add
+sum:int;                    # sum of number1 and number2
+
+number1 = input( "Enter first integer: " )      # prompt user for data
+                                                # read first integer from user into number1
+
+number2 = input( "Enter second integer: " )     # prompt user for data
+                                                # read second integer from user into number2
+
+sum = int(number1) + int(number2)               # add the numbers; store result in sum
+
+
+print( "Sum is %d\n" %sum )                     # display sum

Examples/Chapter2_Examples/fig02_13.py

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+# Fig. 2.13: fig02_13.cpp
+# Comparing integers using if statements, relational operators
+# and equality operators.
+
+
+number1:int     # first integer to compare
+number2:int     # second integer to compare
+
+# ===========================================================
+#  WHY THIS WORKS
+# ===========================================================
+#  The input prompts the user for two integers.
+#
+#  When the user enters the value, they are a string "2 3"
+#
+#  A string of "2 3" cannot be assigned to number1 and
+#  number2 because the variables is declared using 
+#  Parallel Assignment.
+#
+#  Since the input is a string "2 3", we can use string
+#  object function to parse the information so that it can be
+#  unpack and inserted into the Parallel Assignment.
+#
+#  The split function splits the string 2 3 using the space
+#  delimiter, turning the string 2 3 to a list ["2", "3"]
+#
+#  Python will then automatically unpack the list into their
+#  respective variable location.
+number1, number2 = input( "Enter two integers to compare: " ).split( )
+
+if number1 == number2:
+    print( "%s == %s" %(number1, number2) )
+
+if number1 != number2:
+    print( "%s != %s" %(number1, number2) )
+
+if number1 < number2:
+    print( "%s < %s" %(number1, number2) )
+
+if number1 > number2:
+    print( "%s > %s" %(number1, number2) )
+
+if number1 <= number2:
+    print( "%s <= %s" %(number1, number2) )
+
+if number1 >= number2:
+    print( "%s >= %s" %(number1, number2) )

Examples/Chapter3_Examples/fig03_01.py

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+# Fig. 3.1: fig03_01.py
+# Define class GradeBook with a member function displayMessage,
+# create a GradeBook object, and call its displayMessage function.
+
+
+# ==========================================
+#  GradeBook class definition
+# ==========================================
+class GradeBook:
+
+    # ==============================================================
+    #  This is a member function that is responsible for the
+    #  functionality of the class.
+    #
+    #  Noticed that this member function has "self" as its 
+    #  first parameter.
+    #
+    #  This is there to show Python that this is a member function
+    # ==============================================================
+    def displayMessage(self):
+        print( "Welcome to the Grade Book!" )
+
+
+# ==========================================
+#  funtion main begins program execution
+# ==========================================
+myBook:GradeBook = GradeBook( )
+myBook.displayMessage( )
+

Examples/Chapter3_Examples/fig03_01_bkup.py

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+# Fig. 3.1: fig03_01.py
+# Define class GradeBook with a member function displayMessage,
+# create a GradeBook object, and call its displayMessage function.
+
+
+# ==========================================
+#  GradeBook class definition
+# ==========================================
+class GradeBook:
+
+    # ==============================================================
+    #  The declaration of variable is not essential
+    # ==============================================================
+    age:int
+
+
+    # ==============================================================
+    #  This function is python's version of a constructor
+    #  Upon creation, this function will be called first.
+    #
+    #  The 'self' parameter is self referential and is essential
+    #  to be listed as the first parameter.
+    #
+    #  Any subsequent parameter listed is considered additional
+    #  information to initialize the starting state of the object.
+    #
+    #  To set the initialize the variable age.
+    #  'self' referential needs to be the object followed by the
+    #  variable name that you want to initialize.
+    # ==============================================================
+    def __init__(self, age):
+        self.age = age
+
+
+    # ==============================================================
+    #  This is a member function that is responsible in sharing
+    #  private information from the object.
+    # ==============================================================
+    def displayMessage(self):
+        print( "Welcome to the Grade Book! " + str( self.age ) )
+
+
+# ==========================================
+#  funtion main begins program execution
+# ==========================================
+myBook = GradeBook( 25 )
+myBook.displayMessage( )
+

Examples/Chapter3_Examples/fig03_03.py

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+# Fig. 3.3: fig03_03.py
+# Define class GradeBook with a member function that takes a parameter,
+# create a GradeBook object and call its displayMessage function.
+
+class GradeBook:
+    def displayMessage( self, courseName ):
+        print( "Welcome to the grade book for \n" + courseName + "!\n" )
+
+nameOfCourse:str = ""
+myGradeBook:GradeBook = GradeBook( )
+
+print( "Please enter the course name: " )
+nameOfCourse = input( )
+print( )
+
+myGradeBook.displayMessage( nameOfCourse )

Exercise/Chapter2_Exercise/ex02_Exercise_2-16.py

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+'''
+    Question 2.16
+    
+    (Arithmetic) Write a program that asks the user to enter two numbers, obtains the two
+    numbers from the user and prints the sum, product, difference, and quotient of the two numbers.
+'''
+
+a:int = 0
+b:int = 0
+
+a, b = input( "Enter two integers: " ).split( )
+
+print( "Sum is %d" %( int(a) + int(b) ) )
+print( "Difference is %d" %( int(a) - int(b) ) )
+print( "Product is %d" %( int(a) * int(b) ) )
+
+if( int(b) != 0 ):
+    print( "Quotient is %d" %( int(a) / int(b) ) )
+
+if( int(b) == 0 ):
+    print( "Cannot Divide by Zero" )
+

Exercise/Chapter2_Exercise/ex02_Exercise_2-18.py

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+'''
+    Question 2.18
+    
+    (Comparing Integers) Write a program that asks the user to enter two integers, obtains the
+    numbers from the user, then prints the larger number followed by the words "is larger." If the
+    numbers are equal, print the message "These numbers are equal."
+'''
+
+a:int = 0
+b:int = 0
+
+a, b = input( "Enter two integer for comparison: " ).split( )
+
+a = int(a)
+b = int(b)
+
+if( a > b ):
+    print( "%d is larger than %d" %(a, b) )
+
+if( b > a ):
+    print( "%d is larger than %d" %(b, a) )
+
+if( a == b ):
+    print( "These numbers are equal" )

Exercise/Chapter2_Exercise/ex02_Exercise_2-19.py

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+'''
+    Question 2.19
+    
+    (Arithmetic, Smallest and Largest) Write a program that inputs three integers from the keyboard
+    and prints the sum, average, product, smallest and largest of these numbers.
+'''
+
+# get 3 inputs
+a:int = 0
+b:int = 0
+c:int = 0
+largest:int = 0
+smallest:int = 0
+
+a, b, c = input( "Enter three integers: " ).split( )
+
+a = int(a)
+b = int(b)
+c = int(c)
+
+print( "Sum: %d" %( a + b + c ) )
+print( "Average: %d" %( (a + b + c) / 3 ) )
+print( "Product: %d" %( a * b * c ) )
+
+
+largest = a
+if( b > largest ):
+    largest = b
+
+    if( c > largest ):
+        largest = c
+
+smallest = a
+if( b < smallest ):
+    smallest = b
+    if( c < smallest ):
+        smallest = c
+
+print( "Largest: %d" %(largest) )
+print( "Smallest: %d" %(smallest) )

Exercise/Chapter2_Exercise/ex02_Exercise_2-20.py

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+'''
+    Question 2.20
+    
+    (Diameter, Circumference and Area of a Circle) Write a program that reads in the radius of
+    a circle as an integer and prints the circle’s diameter, circumference and area. Use the constant value
+    3.14159 for π. Do all calculations in output statements.
+'''
+
+radius = int( input( "Enter a radius: " ) )
+
+# Diameter (2r) Calculation
+print( "Diameter: %d" %( radius * 2 ) )
+
+# Circumference (2πr) Calculation
+print( "Circumference: %d" %( 2 * 3.14159 * radius ) )
+
+# Area (πr2) Calculation
+print( "Area %d" %( 3.14159 * ( radius * radius ) ) )

Exercise/Chapter2_Exercise/ex02_Exercise_2-23.py

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+'''
+    Question 2.23
+    
+    (Largest and Smallest Integers) Write a program that reads in five integers and determines
+    and prints the largest and the smallest integers in the group. Use only the programming techniques
+    you learned in this chapter.
+'''
+
+a, b, c, d, e = input( "Enter 5 integers: " ).split( )
+
+a = int( a )
+b = int( b )
+c = int( c )
+d = int( d )
+e = int( e )
+
+largest = a
+if( b > largest ):
+    largest = b
+if( c > largest ):
+    largest = c
+if( d > largest ):
+    largest = d
+if( e > largest ):
+    largest = e
+
+smallest = a
+if( b < smallest ):
+    smallest = b
+if( c < smallest ):
+    smallest = c
+if( d < smallest ):
+    smallest = d
+if( e < smallest ):
+    smallest = e
+
+print( "Largest: %d" %( largest ) )
+print( "Smallest: %d" %( smallest ) )

Exercise/Chapter2_Exercise/ex02_Exercise_2-24.py

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+'''
+    Question 2.24
+    
+    (Odd or Even) Write a program that reads an integer and determines and prints whether
+    it's odd or even. [Hint: Use the modulus operator. An even number is a multiple of two. Any multiple
+    of two leaves a remainder of zero when divided by 2.]
+'''
+
+a = int( input( "Enter an integer:" ) )
+
+if( a % 2 == 0 ):
+    print( "Even" )
+    
+if( a % 2 != 0 ):
+    print( "Odd" )

Exercise/Chapter2_Exercise/ex02_Exercise_2-25.py

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+'''
+    Question 2.25
+    
+    (Multiples) Write a program that reads in two integers and determines and prints if the first
+    is a multiple of the second. [Hint: Use the modulus operator.]
+'''
+
+a, b = input( "Enter two integers: " ).split( )
+a = int( a )
+b = int( b )
+
+if( a % b == 0 ):
+    print( "%d is multiple of %d" %(a, b) )
+
+if( a % b != 0 ):
+    print( "%d is not multiple of %d" %(a, b) )

Exercise/Chapter2_Exercise/ex02_Exercise_2-27.py

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+'''
+    Question 2.27
+
+    (Integer Equivalent of a Character) Here is a peek ahead. In this chapter you learned about
+    integers and the type int. C++ can also represent uppercase letters, lowercase letters and a considerable
+    variety of special symbols. C++ uses small integers internally to represent each different character.
+    The set of characters a computer uses and the corresponding integer representations for those
+    characters are called that computer's character set. You can print a character by enclosing that character
+    in single quotes, as with
+        
+        cout << 'A'; // print an uppercase A
+
+    You can print the integer equivalent of a character using static_cast as follows:
+        
+        cout << static_cast< int >( 'A' ); // print 'A' as an integer
+
+    This is called a cast operation (we formally introduce casts in Chapter 4). When the preceding
+    statement executes, it prints the value 65 (on systems that use the ASCII character set). Write a
+    program that prints the integer equivalent of a character typed at the keyboard. Store the input in a
+    variable of type char. Test your program several times using uppercase letters, lowercase letters, digits
+    and special characters (like $).
+'''
+print( ord( input( "Enter a single character: " ) ) )