Computer Department. Question (1): State whether each of the following is true or false. Question (2): Select the correct answer from the following:

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1 Computer Department Program: Computer Midterm Exam Date : 19/11/2016 Major: Information & communication technology 1 st Semester Time : 1 hr (10:00 11:00) Course: Introduction to Programming 2016/2017 Instructors: Dr. Nehad Hammad Eng. Mohamed Abubaker Exam Instructions: 1. Be sure that you have different pages. 2. Be sure that you have 6 different questions. 3. Answer all the questions of the exam. Note: there is an optional part in question #6 4. The total grade of the exam is (30) Name: INSTRUCTOR.. Student s ID:.... Question (1): State whether each of the following is true or false. [ 3 points, 0. point for each] 1. (T ) Every C++ program begins execution at the function main. 2. (F ) Every C++ statement ends with a comma. 3. (F ) The output statement is follow by >> operator. 4. (T ) All variables must be declared before they are used.. (F ) The default case is required in the switch selection statement. 6. (F ) The expression ( x > y && a < b ) is true if either the expression x > y is true or the expression a < b is true. Question (2): Select the correct answer from the following: [7 points, 1 point for each] 1. Which of the following operators have high priority? a. + b Which of the following is a valid variable name? a. _num b. 3num 3. To declare a constant MAX_LENGTH, you write a. float MAX_LENGTH = 99.98; b. const float MAX_LENGTH = 99.98; c. * d. > c. num+3 d. int c. constant float MAX_LENGTH = 99.98; d. const MAX_LENGTH = 99.98;

2 4. What is the value of /2? a. 2 b. 0. The sign is used before include statement a. % b. & c. 2. d. 3 c. # d. << 6. How many times will the following code print "Welcome to C++"? int count = 0; while (++count < 10) cout << "Welcome to C++"; a. 8 b The scape sequences \n means: a. New Line b. Tap space c. 10 d. 11 c. Backspace d. Alert Question (3): Rewrite the following codes as needed? [4 points, 2 points for each] 1. Covert the following if statement into a switch statement: int a; int x = 1; cin >> a; if (a == 2) x += 2; if (a == 3) x += 3; if (a == 4) x += 4; cout << "Not defined"; int a; int x = 1; cin >> a; switch(a) case 2: x += 2; case 3: x += 3; case 4: x += 4; default: cout << "Not defined"; 2

3 2. Covert the following while loop into a for loop: int i = 1; int sum = 0; while (sum < 100) i++; int sum = 0; for(int i = 1; sum < 100; i++) Question (4): Identify and correct the errors in each of the following: [ points] Code (0. Point for each error) int x = 1; y = 3; if( x => y) ; cout << y; Correction int x = 1, y = 3; if( x >= y) cout << y; unsigned int x = 1; while (x <= 10); ++x (error ;) unsigned int x = 1; while (x <= 10) ++x ; int y = 0; for(int x = 100, x >= 1, ++x) cout << ++(x + y) << \n; int y = 0; for(int x = 100; x >= 1; --x) cout << x + y + 1 << "\n"; Question (): What does the following program print? [ points] int x =2; x += 3; //cout << x++; Code Output 3

4 int x = 4, y = 6; int z = (y > 6)? 0 : 7; int k = ++x * y--; int m = y + x + z++; cout << k << endl; cout << m << endl; int score = 70; if (score == 100) cout << "A perfect score\n"; cout << "Not a perfect score\n"; Not a perfect score int number = 2; int i; bool isprime = true; for (i = 2; i < number; i++) if (number % i == 0) isprime = false; i is isprime is 0 cout << "i is " << i ; cout << " isprime is "; cout << isprime << endl; int i = 0; do i += 1; if (i % 2 == 1) continue; cout << i + 1 << endl; while (i < 10);

5 Question (6): Select TWO of the following sub-questions [6 points, 3 points for each] 1. Write a C++ program that asks the user to enter three numbers and prints the smallest of these numbers. 2. Write a C++ program that uses a loop statement to calculate the sum of even numbers from 1 to Write a C++ program that uses a loop statement to enter an integer number and for each time finds the total and the average of entered numbers. If user enters 0, exit the program. int number10; int number2 = 0; int number3 = 0; int smallest = 0; cout << "Enter Three integer numbers: "; cin >> number1 >> number2 >> number3; smallest = number1; if (number2 < smallest) smallest = number2; if (number3 < smallest) smallest = number3; cout << "Smallest number is = " << smallest; int sum0; for(int i = 2; i <= 100; i += 2) //or from i++; use if(i%2==0)sum+=i; cout << "The sum is = " << sum; int number = 0, total = 0; int count = 1; double average = 0; while (true) cout << "Enter: (0 to end)"; cin >> number; if (number == 0) total += number; average = (double)total / count; count++; cout << "Total = " << total << endl; cout << "Average = " << average << endl; End of Exam

The American University in Cairo Department of Computer Science & Engineering CSCI &09 Dr. KHALIL Exam-I Fall 2011

The American University in Cairo Department of Computer Science & Engineering CSCI 106-07&09 Dr. KHALIL Exam-I Fall 2011 Last Name :... ID:... First Name:... Form I Section No.: EXAMINATION INSTRUCTIONS