Topics for Exam1: This sheet is intended to help you prepare for the first exam in this course. The following topics have been covered in the first 5 weeks of the course. The exam will cover chapters 1 - 6 and 9 of the textbook, and all of the lectures through the "Loops" section of Lecture 12 on Monday, 2/17/14. It will also cover labs 1 - 4 and projects 0, 1 and 2. Each of the following topics may appear on the exam.

1.  Problem solving techniques
	Divide, Conquer and Glue
	Abstraction
	Black box abstraction
2.  Basic Syntax
	Form of C++ program
	Simple Data types: float, double, int, char
	Identifiers, Variables and Constants
	Assignment statements
	Arithmetic Expressions
		Precedence rules
		Associativity
	Type conversion and Type Casts
	Calling functions
	Using C++ libraries
3.  Input and Output
	Filestreams, cin and cout
	insertion and extraction operators
	output formatting (setf, setprecision(), setw())
	Interactive I/O
	get(), ignore() 
	File input and output
	opening and closing files
	Stream fail states.
4.  Conditional Statements
	Basic syntax
	Boolean (true/false) expressions
	Relational operators
	Logical operators
	Short circuiting
	Nested if
5.  Switch
	Syntax
	Writing cases
	Using break statements
6.  Loops
	while loops
	for loops
	do-while loops
	event-controlled loops
	count-controlled loops
	nested loops

Practice Problems

1) Consider the following statement:

players = teamA + teamB;

a) What kind of C++ statement is this?

b) What is the first thing C++ does when executing this statement?

2) Consider the following function declaration:

float cube(float number);

a) What does the float at the beginning of the line refer to?

  b) Write a statement to find the cube of 7.3 and assign the result to a variable named answer.

3) Compute the value of the following expressions:

a)   30 / 5 % 4 + 2

b)   (17 - 11) / 3 + 3

c) Add parentheses to part b so that the addition is performed before the division.

d) What is the value of the expression in part c ?

4) Write a program that does the following:

1) Prompt the user to input a number.
2) Input the number from the keyboard
3) Echo print the number
4) If the number is less than 100, write:
XX is a low number.
where XX refers to the number inputted by the user.
5) Otherwise, write:
XX is a high number.

5) Given these boolean variables:

x = true, y = false, z = true

What is the value (true/false) of each of the following?

i)     x && (y || z)

 

ii)   !x || !(y && z)

 

iii)   y || (x && !z)

6) What is the output after executing the following switch:

int Day = 4;
switch (Day) {
   case 1:
      cout << "Sunday" << endl;
   case 2:
      cout << "Monday" << endl;
   case 3:
     cout << "Tuesday" << endl;
   case 4:
     cout << "Wednesday" << endl;
   case 5:
     cout << "Thursday"<< endl;
   case 6:
      cout << "Friday" << endl;
   case 7:
      cout << "Saturday" << endl;
}	

7) Consider the following while loop:

	sum = 0;
	count = 5;
	while (count <= 10) {
		sum = sum + count;
		count ++;
		//show values here
	}

a) Fill in the following table for the values of count and sum each time through the loop (there may be more rows than you need in the table):

sum	count
0	5

b) Write a for loop that does the equivalent to the while loop in 7a.

8) Consider the following C++ source code:

	int a = 4;
	int b = 3;
	float c;

	c = a/b;

a) What is the value of c after executing the above 4 lines?

b) Rewrite the 4th line using type-casts to make C++ perform floating point division for the value of a divided by b.

9) Consider the following C++ code:

	float x = 7.3;
	float y = 8.4;
	ofstream outFile;

	outFile.open("review.out");

	cout.setf(ios::fixed, ios::floatfield);
	cout.setf(ios::showpoint);

	outFile << "The value of x*y is: " << x*y;

Why isn't the result displayed in fixed point notation, but instead shown in exponential notation?

10) Write a conditional that accomplishes the following:

i) If gender is 'F' and height is greater than 70 inches, invite the user to tryout for the women's basketball team.

ii) If gender is 'M' and height is greater than 75 inches, invite the user to tryout for the men's basketball team.

iii) Otherwise, print out "Basketball is not for you."

Start with this code:

	int height;
	char gender;
	cout << "Enter your height in inches: ";
	cin >> height;
	cout << "Enter your gender (M/F): ";
	cin >> gender;
	//write conditional here.

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Constance Royden--croyden@cs.holycross.edu
Computer Science 131
Last Modified: February 23, 2014
Page Expires: August 10, 2014