Can't run my 'if, elseif, else' code

score= randi(100);
if score < 20
grade= 'D';
print grade
elseif score < 40
grade= 'C';
print grade
elseif score < 60
grade= 'B';
print grade
elseif score < 80
grade= 'B+';
print grade
else 
    grade= 'A';
print grade
end

i tried to run a basic if else loop but no matter what score i input in the command wndow, my answer is always 'A'.

Answer 1

[KSSV]

score= randi(100);
if score < 20
    grade = 'D';    
elseif score < 40
    grade= 'C';    
elseif score < 60
    grade= 'B';    
elseif score < 80
    grade= 'B+';    
else
    grade= 'A';    
end
disp(grade)

Answer 2

[Dyuman Joshi]

if-else is not a loop, they are conditional statements.

If you want to print/display something, use sprintf or fprintf or disp. However, if you want see the value of a variable, type the variable name without using semi colon

score= randi(100)

score = 52

if score < 20
    grade= 'D';
elseif score < 40
    grade= 'C';
elseif score < 60
    grade= 'B';
elseif score < 80
    grade= 'B+';
else 
    grade= 'A';
end
grade

grade = 'B'

[Waqar]

Hi. Thank you for your response. However, I still couldn't run the code. On the command window when I assign a value to the score:

score= 33

the grade output is random:

grade

= 'A'

May I know what am I doing wrong here? Thanks!

[Dyuman Joshi]

Are you running your whole code on command window? or are you running a script?

Variables you define via command window are not accessible to the script.

Also, in a script, when you change the value of any variable, you need to run your script again to update the result.

[Waqar]

While running the script, it's working fine. But I wanted to enter values in the command window as input and see if the grades correspond to them

[Dyuman Joshi]

"But I wanted to enter values in the command window as input and see if the grades correspond to them "

As I said above, Variables you define via command window are not accessible to the script.

A better alternative would be to use a function -

%You can call the function directly
fun(25)

ans = 'C'

%or define a variable and use variable as input
score=randi(100)

score = 80

fun(score)

ans = 'A'

%calling the function again with a different value
fun(75)

ans = 'B+'

%change the value of score and call the function again
score=randi(100)

score = 29

fun(score)

ans = 'C'

function grade = fun(score);
    if score < 20
        grade= 'D';
    elseif score < 40
        grade= 'C';
    elseif score < 60
        grade= 'B';
    elseif score < 80
        grade= 'B+';
    else 
        grade= 'A';
    end
end

[Waqar]

Worked! Thanks a lot!

[Dyuman Joshi]

You are welcome!