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

2023 3 15
2 个回答
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更新时间：2023 3 15
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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'.

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KSSV
KSSV 2023-3-15

0 个投票

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)

更多回答（1 个）

Dyuman Joshi
Dyuman Joshi 2023-3-15
编辑：Dyuman Joshi 2023-3-15
Ran in:

1 个投票

Ran in:
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'

6 个评论
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Waqar
Waqar 2023-3-15
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
Dyuman Joshi 2023-3-15
编辑：Dyuman Joshi 2023-3-15
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
Waqar 2023-3-15
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
Dyuman Joshi 2023-3-15
编辑：Dyuman Joshi 2023-3-15
Ran in:
Ran in:
"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
Waqar 2023-3-15
Worked! Thanks a lot!

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