computer engineering department cmpe110 midterm sample
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Computer Engineering Department CMPE110 Midterm Sample Questions, 2017/2018 - Fall
Q1) Give the correct answer for following:
1. What is the value of x after the following statement? double x; x = 3.0 / 4.0 + 3 + 2 / 4
a. 5.75 b. 4.25 c. 1.75 d. 3.75
2. 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.
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. 0
9. 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? #include <iostream>
using namespace std;
int main(){
int x;
for(x=325;x > 0; x /= 10)
{cout<< (x % 10);}
return 0;}
Output:
……………………………………………………………….
The main function of this code is
……………………………………………………………………………………………….
Q3) Write a program that reads the radius (r) and the height (h) of a cylinder and then computes
its volume and surface area. The volume and the surface area are computed as
hrvolume 2 222 rhrareasurface
Note: Let all variables be of type float. A sample run of the code should be as
#include<iostream>
using namespace std;
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
………………………………………
………………………………………
return 0;}
Enter the radius: 6.5
Enter the height: 9.5
The volume = 1275.86
The surface area = 658.37
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”;
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;
Enter your grade: 80
……………………………………………………….
……………………………………………………….
……………………………………………………….
……………………………………………………….
Enter a year: 2017
……………………………………………………….
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:
case 12: …………………………………………………………………………………..
default: …………………………………………………………………………………..}
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
Age Class
0 – 4 Baby
5 –14 Child
15 –19 Teenager
20 –64 Adult
above
64
Old
How old are you? 18
You are a teenager
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.
READ Grade
BEGIN
END
Min=Grade
Print Min
READ N
i <= N
i = 1 Min=100 Sum=0
True
i = i + 1
False
Grade < Min
True
False
#include<iostream>
using namespace std;
int main(){
…………… …………… ……………
………………………………………
………………………………………
………………………………………
………………………………………
………………………………………
………………………………………
………………………………………
………………………………………
………………………………………
………………………………………
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………………………………………
………………………………………
………………………………………
………………………………………
return 0;}
Sum+=Grade
Average=sum/N
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
Print Average
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 (5+10+20, 15 is not included because it can be divided
by 3 without a reminder).
#include <iostream>
using namespace std;
int main(){int N1, N2, Min, Max,i, Sum=0;
cin>>N1>>N2;
// Find the minimum (Min) and the maximum (Max) of N1 and N2
………………………………………………………….
………………………………………………………….
………………………………………………………….
………………………………………………………….
………………………………………………………….
………………………………………………………….
// Find the required sum
………………………………………………………….
………………………………………………………….
………………………………………………………….
………………………………………………………….
………………………………………………………….
// Print the result on the monitor
cout<<”Sum =”<< Sum;
return 0;}
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>
using namespace std;
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.";
} return 0;}
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:
2 2= 2 cos( )SideC SideA SideB SideA SideB A
Note: The angle A is entered from keyboard in degree and should be translated into
radian as =180
AA
#include <iostream>
#include <cmath>
using namespace std;
// define the constant with the name of PI and value of 3.1459
……………………………………………………………………………………………….
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
……………………………………………………………………………………………….
return 0;}
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:
Complete the following code to do the above task.
#include <iostream>
using namespace std;
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;
return 0;}
Lab 10 %
Midterm 40 %
Final 50 %
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:
#include <iostream>
using namespace std;
int main(){
// Declaration
…………………………………………………………….
…………………………………………………………….
// Get the input from the keyboard
…………………………………………………………….
…………………………………………………………….
…………………………………………………………….
…………………………………………………………….
// Perform the required task
…………………………………………………
……………………………… ……………………………… ………………………………
……………………………… ……………………………… ………………………………
……………………………… ……………………………… ………………………………
……………………………… ……………………………… ………………………………
……………………………… ……………………………… ………………………………
……………………………… ……………………………… ………………………………
return 0;}
*** Calculator Problem ***
Enter two numbers: 4 3
Enter one operator: +
4 + 3 = 7
*** Calculator Problem ***
Enter two numbers: 4 3
Enter one operator: >
Wrong operaor
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
2 2
2 1 2 1( ) ( )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: 1.5 -3.4
Enter x2 and y2: 4 5
The distance of the two points is 8.764131445842194
Q17)The following FLOWCHART computes the area of a triangle. Write the
corresponding C++ code.
#include <iostream>
#include <cmath>
using namespace std;
int main(){
double A,B,C,P,S, Area;
………………………………………………………………
………………………………………………………………
………………………………………………………………
………………………………………………………………
………………………………………………………………
………………………………………………………………
………………………………………………………………
………………………………………………………………
………………………………………………………………
return 0;}
BEGIN
A+B>C and B+C>A and C+A>B
False
P = A + B + C S =P/2
Area =
READ A, B,C
True
End
PRINT “Not Triangle”
PRINT Area
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 = 5 + ++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':
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.
𝑓(𝑥) = {
𝑥 − 3 𝑖𝑓 𝑥 < 50
𝑥2 𝑖𝑓 50 ≤ 𝑥 < 100𝑥/2 𝑖𝑓 𝑥 = 100
0 𝑜𝑡ℎ𝑒𝑟𝑤𝑖𝑠𝑒
Q20) Trace the following programs and write the output in the space provided
below.
int k=0, x=0; for (k=1; k<7; ++k) { if (k%3 == 1) x=x+k; else x- -; cout<< x<<endl; }
int k=0, m=0, x=0; 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; 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++; }
int k=5, x=0; 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: