GENN004_Spring2012_Midterm2

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CHS Spring 2012

Introduction to Computers and

Engineering (GENN004(

Cairo University Midterm Exam

Time Allowed: 60 minutes

Date: 11 April 2012

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Maximum Grade: 20 Points

Name: I.D.: Group:

Question 1: [10 pts]1. Which one is an illegal variable name?

c. dog

d. under2dog

a. underdog

b. dog-1

2. The single most important objective of this course is to learn

c. MATLAB

d. programming concepts

a. solve engineering problems

b. to be in class on time

3. Write the following equation in one Matlab code statement:

)52)(3(8

2

yxxyxZ += Z=sqrt((3*x^8-x*y)*(2*x+5*y)^2)

4. The MATLAB output from the last MATLAB statement would be

abc = 6;

for i=1:2:4

abc = abc +6;

end

abc =18

5. The values that the loop variable "i" takes are

for i = 0:0.6:3.2 0,0.6,1.2,1.8,2.4,3

6. Evaluate the following MATLAB expressions

b. 3 ^ 2 ^ 2=81a. 2 + ceil(6 / 9 + 3 * 2) / 2 3=2.5

7. What is the value of h in the following cases:

a. T = 50 h = 0 if T < 30

h = 2*T + 1;

b. T = 0 h = 1 elseif T < 10

h = T 2;

else

h = 0;

end

8. What would appear on the screen after the execution of the following script:

m=123.21;

n=1.1252;

fprintf('m:%8.2f:%.3f',n,m);m : 1 . 1 3 : 1 2 3 . 2 1 0

9. Determine if the following conditions are true or false. (Show your work.)

X= 10; y=0;

a. X >= yTrue

b. X == yfalse

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Date: 11 April 2012

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Question 2: [3 pt]

Find and correct all the syntax errors in the following script:

yourSelection = 11;while urSelection ~= s

fprintf('\tI: To input a grade\n');

fprintf('\ts: To stop\n');

urSelection = input('Enter your choice:');

ifurSelection == (I)

urGrade = ('Enter your grade: ');

maxGrade = ('Enter the maximum grade: ');

fprintf('Your grade is %.2f ',urGrade);

fprintf('out of %.2f = ',maxGrade);

fprintf('%.2f%%%\n\n',urGrade/maxGrade%100 );

end

end

Corrected ScripturSelection = 11;while urSelection ~= s

fprintf('\tI: To input a grade\n');

fprintf('\ts: To stop\n');

urSelection = input('Enter your choice:',s);

if urSelection == I

urGrade = input('Enter your grade: ');

maxGrade = input('Enter the maximum grade:

');

fprintf('Your grade is %.2f ',urGrade);

fprintf('out of %.2f = ',maxGrade);

fprintf('%.2f%%\n\n',urGrade/maxGrade*100 );end

end

Question 3: [3 pt]

What is the output of the following script?

sum1 = 0;

fori = 1:1:2

forj = 1:2:2

sum1 = sum1 + i*j;

endend

fprintf('sum1 = %d', sum1)

Script Output

Sum1=3

Question 4: [4 pt]

Write a script that reads positive numbers from the user, and then prints the total number of entered

odd numbers and the sum of all entered odd numbers in the exact format as shown below in the

example. Your script should end when

the user enters a negative number.Sample Inputs/Outputs:

Input :Please enter a number: 90

Please enter a number: 13

Please enter a number: 11

Please enter a number: -10Output :

Number of entered odd numbers is 2

Sum of all entered odd numbers is 24

End Of The Program!

Sum=0;

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Date: 11 April 2012

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Count=0;

N=input(please enter a number);

While N>0If rem(N,2)==1

Count=Count+1;

Sum=Sum+N;

End

N=input(please enter a number);

End

Fprintf(Number of entered odd numbers is %d\n Sum of all entered odd numbers is %d \n

End of program, Count, Sum);

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GENN004_Spring2012_Midterm2

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