Grading the students performance.

Given the correct key in the form of an array correct_key='.........'; write a program to evaluate the grade of a student from the answer key. use -1 if answer is wrong, 10 if answer is correct and 0 if no answer.

[RITTIK KUMAR GHOSH]

being more specific, there were total of 8 questions carrying 10 marks for a correct answer and -1 for wrong answer and 0 for an unattended question. how to evaluate it?

Answer 1

[MA]

%w=wrong
%c=correct
%o=unanswered
syms w c o
s=0;
for i=1:5
    g(i)=input('answer=  ');
    if g(i)==w
        s=s-1;
    elseif g(i)==c
        s=s+10;
    elseif g(i)==o
        s=s+0;
    end
end
display('grade')
display(s)

[RITTIK KUMAR GHOSH]

can you help me out with the commands?

[MA]

you have 5 question, program ask you about the answer of each question then it gives your score

[RITTIK KUMAR GHOSH]

thanks

[MA]

you're welcome

Answer 2

[RITTIK KUMAR GHOSH]

1.When I am putting in the answers as 10 0 -1 10 10, the grade remains the same in each case, it is not changing and showing the result 0. why is it so? 2.Why there are 2 spaces in this script('answer= ') can you please explain?

[MA]

i run program for your case and get the below result:

answer=  c
answer=  o
answer=  w
answer=  c
answer=  c
grade

s =

      29

[RITTIK KUMAR GHOSH]

answer= c The following error occurred converting from sym to double: Error using mupadmex Error in MuPAD command: DOUBLE cannot convert the input expression into a double array. If the input expression contains a symbolic variable, use the VPA function instead. This is what is coming when I am trying to run the program

[RITTIK KUMAR GHOSH]

then I tried out with the numerical inputs and every time it is s=0

[RITTIK KUMAR GHOSH]

thanks for all the help, got it correct