Computer Engineering Department CMPE110 Midterm Sample Questions, 2017/ Fall

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1 Computer Engineering Department CMPE110 Midterm Sample Questions, 2017/ Fall Q1) Give the correct answer for following: 1. What is the value of x after the following statement? double x; x = 3.0 / / 4 a b c d What is the correct way to write the condition y < x < z in C++ form? a. (y < x < z) b. ( (y < x) && z) c. ((y > x) (y < z)) d. ((y < x) && (x < z)) 3. What is the output of the following code fragment? int x=0; while( x < 5) cout << x << endl; x ++; cout << x << endl; a. 0 b. 5 c. 4 d. unable to determine 4. Given the following code fragment, which of the following expressions is always true? int x; cin >> x; a. if( x < 3) b. if( x==1) c. if( (x / 3) >1 ) d. if( x = 1) 5. What is wrong with the following switch statement? int ans; cout <<"Type y for yes on n for no\n"; cin >> ans; switch (ans) { case 'y': case 'Y': cout << "You said yes\n"; break; case 'n': case 'N': cout << "You said no\n"; break; default: cout <<"invalid answer\n"; a. ans is an int b. break; is illegal syntax c. nothing d. there are no break statements on 2 cases.

2 6. int a = 5, b = 8, t; t = a;a = b;b = t; cout << a<< ", " << b; A. 5,8 B. 5,5 C. 8,8 D. 8,5 7. int x=5; if( x > 5) cout << "x is bigger than 5. "; cout <<"That is all. "; cout << "Goodbye\n"; a. x is bigger than 5. That is all b. x is bigger than 5 c. That is all. Goodbye d. Goodbye 8. int FD, Year=2019; FD=Year%4 == 0?29 :28; cout<<fd; A. 29 B. 28 C. 1 D int a = 5, b = 8; a = b;b = a; cout << a<< ", " << b; A. 5,8 B. 5,5 C. 8,8 D. 8,5 Q2) Consider the code given below. Show its output and explain what does the code do? Output: #include <iostream>. int main(){ int x; The main function of this code is for(x=325;x > 0; x /= 10). {cout<< (x % 10);

3 Q3) Write a program that reads the radius (r) and the height (h) of a cylinder and then computes its volume and surface area. volume r 2 h surface area 2 r h 2 r The volume and the surface area are computed as Note: Let all variables be of type float. A sample run of the code should be as Enter the radius: 6.5 Enter the height: 9.5 The volume = The surface area = #include<iostream> int main(){ //declare the variables // write necessary statements to read the radius from keyboard // write necessary statements to read the height from keyboard // perform the required operations // show the outputs on the monitor

4 Q4) What is the output of the following code segments: I/ int Year; cout<< Enter a year: ; cin>> year; FebDays=year%4 == 0?29 :28; cout<< FebDays= << FebDays; II/ int grade; cout<< Enter your Grade: ; cin>> grade; if(grade >= 60) {cout<< You passed << endl; cout<< Congratulations\n ; else; cout<< You failed << endl; cout<< SORRY\n ; Enter a year: Enter your grade: III/ Section II may contain logical error(s). If any, introduce your correction(s) on the code segment. Q5) What is the output of the following code segments: 1. int i, j=2; for(i=3; i<=8; i+=2) {j+=i; if (j>6) break; cout<< J= <<j; 2. int i, Sum=2; for(i=3; i<=10; i+=2) {if (i%3==0) continue; Sum+=i; cout<< Sum= <<Sum;

5 Q6) The following code segment is designed to read the age of a person, and display his/her class as shown in the given table. Fill in the blanks to complete the required task. A sample run of the code is: int Age; cout<< How old are you? ; cin>>age; switch(.){ case 0 :.. case 1 : case 2 :.. case 3 :.. case 4 : case 5 : case 6 : case 7 : case 8 : case 9 : case 10: case 11: How old are you? 18 You are a teenager case 12:.. default:.. Age Class 0 4 Baby 5 14 Child Teenager Adult above Old 64 Q7) Write the equivalent C++ condition to implement the following statements. Statement Equivalent C++ condition x greater than 0 and not more than 10 x is even and y is odd x is outside the interval [-5,20] X and y are less than or equal to 30

6 Q8) The following flowchart is designed to read from the keyboard the Grades of N students in CMPE110 course, and then it computes and prints on the monitor the minimum grade and the average grade. Implement this flowchart in C++ language. Note: let variable average be of type double, and other variables are of type integer. BEGIN READ N i = 1 Min=100 Sum=0 Design your code to have the following sample run: Enter number of students (N): 3 Enter grade of student 1: 18 Enter grade of student 2: 19 Enter grade of student 3: 17 The minimum grade is 17 The average grade is 18.0 i <= N True READ Grade Sum+=Grade Grade < Min True Min=Grade i = i + 1 False Average=sum/N Print Min Print Average False END #include<iostream> int main(){

7 Q9) Complete the following code that reads two integer numbers (N1 and N2) and then finds the sum of all integers, between N1 and N2, that can be divided by 5 without a reminder. Do not include in the sum those integers that are divided by 3 without a reminder. Note: first, you should find the minimum and the maximum of N1 and N2. For example, if N1=23 and N2=4, then the program should find Min=4, Max=23 and then prints on the monitor: Sum = 35 ( , 15 is not included because it can be divided by 3 without a reminder). #include <iostream> int main(){int N1, N2, Min, Max,i, Sum=0; cin>>n1>>n2; // Find the minimum (Min) and the maximum (Max) of N1 and N // Find the required sum..... // Print the result on the monitor cout<< Sum = << Sum;

8 Q10) Consider the following code: Line 1 Line 2 Line 3 Line 4 Line 5 Line 6 Line 7 Line 8 Line 9 Line 10 Line 11 #include<iostream> int main(){ int Digit; cin>>digit; switch(digit) {case 0 : case 1 : cout<<"this digit is a binary."; default: cout<<"this digit is not a binary."; A/ Trace this code for the following input: Input Output 2 1 B/ This code may contain logical error(s), indicate which line(s), and if any, give below the correct one(s) Line(if any) should be Q11) Write a program that reads the lengths of two sides of a triangle (SideA, SideB) and the angle between them (A) and calculates the length of the third side (SideC) using the following formula: SideC SideA SideB SideA SideB A 2 2 = 2 cos( ) Note: The angle A is entered from keyboard in degree and should be translated into A radian as A= 180 #include <iostream> #include <cmath> // define the constant with the name of PI and value of int main(){// Variable declarations. // read SideA and SideB and angle A from keyboard. // tranlate the angle A into radian. // compute SideC. // print SideC on monitor.

9 Q12) It is required to write a code to read from the keyboard the lab (Lab), the midterm (Mid), and the final (Final) points of a student and then computes his letter grade (Lgrade). Let the letter grades be computed as Total point (Tpoint) Letter grade 85 Tpoint 100 A 75 Tpoint < 85 B 65 Tpoint < 75 C 55 Tpoint < 65 D Otherwise F where Tpoint is computed from the Lab, the Mid, and the Final points according to the following weights: Lab 10 % Midterm 40 % Final 50 % Complete the following code to do the above task. #include <iostream> int main(){ // Declaration.. // Get the input from the keyboard cin>>lab>>mid>>final; // Compute Total point (Tpoint). // Compute Letter Grade (Lgrade) // Display Letter grade on monitor cout<< Your letter grades is << Lgrade;

10 Q13) Write a C++ code that reads two integer numbers and one operator (+, -, *, /, %) and then perform the required operation. Note: If the user enters a wrong operator, then your code should display wrong operator as an output. Write the code using switch selective structure (do not use if/else). A sample run of the code must be as follows: *** Calculator Problem *** Enter two numbers: 4 3 Enter one operator: = 7 *** Calculator Problem *** Enter two numbers: 4 3 Enter one operator: > Wrong operaor #include <iostream> int main(){ // Declaration.. // Get the input from the keyboard.... // Perform the required task

11 Q14) Re-write the following if/else using switch statement: if(digit==0) cout<< ZERO ; else if(digit==1) cout<< ONE ; else cout<< Not a Binary Digit ; Q15) Re-write the following if/else using conditional expression operator (?:) if(number % 2 = = 0) cout<< EVEN Number ; else cout<< ODD Number ; a) Re-write the following if/else using switch statement: if(digit==0 Digit==1) cout<< Binary ; else cout Not Binary ; b) Re-write the following code using for-loop: year=1900; sum=0; while(year<=4002) { sum+=year; cout<<"year="<<year; year+=sum; Q16) Write a program that prompts the user to enter two points (x1, y1) and (x2, y2) and displays their distances. The formula for computing the distance (d) is d ( x x ) ( y y ) Note you can use pow(a,0.5) to compute a. Let all variables be of type double. Here is a sample run: Enter x1 and y1: Enter x2 and y2: 4 5 The distance of the two points is

12 Q17)The following FLOWCHART computes the area of a triangle. Write the corresponding C++ code. BEGIN READ A, B,C True False A+B>C and B+C>A and C+A>B P = A + B + C S =P/2 Area = PRINT Not Triangle PRINT Area End #include <iostream> #include <cmath> int main(){ double A,B,C,P,S, Area;

13 Q18) a) Given int i = 4, j = 3, k = 6, m = 4; what is the output of i * = j + k; cout<< i= <<i; b) Given int i = 4, j = 3, k = 6, m = 4; what is the output of k =++m+ 5; cout<< k= <<k; c) Find the result of the following expressions: Expression Result 6 >= 4 >= 2 (double) (10/4) / (int) 2.5 int a=4, b=7; a++ * --b 7!=4!=1 int year=2016; year%4 == 0? 29 :28; d) Show the output of the following code segments: A/ int x1=1, x2=1, i, y, z; float f; y = 5 + x1--; z = x2; i=35/10; f = 10./4 * i; cout << "Y= " << y << endl; cout << "Z = " << z << endl; cout << "F= " << f; B/ char ch = 'b'; switch (ch) {case 'a': case 'A': cout << ch << endl; break; case 'b': case 'B': cout << ch << endl; case 'c':

14 case 'C': cout << ch << endl; break; case 'd': case 'D': cout << ch << endl; C/ bool even = false; cout << (even? "true" : "false") << endl; Q19) Consider the definition of the following f(x) function. Write a code read x, and then calculate and display the value of f(x). The value of input x must be entered from keyboard. x 3 if x < 50 f(x) = { x 2 if 50 x < 100 x/2 if x = otherwise

15 Q20) Trace the following programs and write the output in the space provided below. int k=0, x=0; int k=0, m=0, x=0; for (k=1; k<7; ++k) { if (k%3 == 1) x=x+k; else x- -; cout<< x<<endl; { for (k=1; k<4; ++k) for (m=0; m<k; ++m) { if (k%2 == 0) x++; else x- -; cout<< x<<endl; Output: Output: int k=0, x=0; int k=5, x=0; { while (k<5) switch ( (k+x) % 4 ) { case 0: case 1: x = x + 2; break; case 2: x = x - 1; break; default: x = x * 2; cout<< x<<endl; k++; do { if (x==1) x=0; else if (x==2) x=2; else x=3; cout<< x<<endl; x- -; k- -; while (k>=0); Output: Output:

CMPE110, Sample questions

CMPE110, Sample questions Number : Name :... Q1)Give the correct answer for following: 1. What is the value of x after the following statement? double x; x = 3.0 / 4.0 + 3 + 2 / 4 a. 5.75 b. 4.25 c. 1.75