Why do I get this response 'Operands to the || and && operators must be convertible to logical scalar values.'?

Question

Philip 2012-7-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44345-why-do-i-get-this-response-operands-to-the-and-operators-must-be-convertible-to-logical-scala

I wrote this so a user could input a numeric grade and the letter grade would display. I am new to matlab and any help is greatly appreciated.

clear, clc
input('Enter a Grade in Numerical Form?','s');
Grade=ans;
G=Grade;
if G>=90&&G<=100
    fprintf('A\n')
end
if G>=80&&G<90
    fprintf('B\n')
end
if G>=70&&G<80
    fprintf('C\n')
end
if G>=60&&G<70
    fprintf('D\n')
end
if G<60
    fprintf('F\n')
end

[EDITED, Jan, please format your code - thanks!]

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Answer 1

Nirmal 2012-7-23

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G=str2num(Grade);

G will be a string so you need to convert that to a number using the str2num function. Its better to use if elseif rather than multiple if statements.

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Philip 2012-7-23

Thanks for the help. I will also change it around if it is better to use if elseif.

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Answer 2

Jan 2012-7-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44345-why-do-i-get-this-response-operands-to-the-and-operators-must-be-convertible-to-logical-scala#answer_54364

在 MATLAB Online 中打开

G = input('Enter a Grade in Numerical Form?');
if G > 100
  % do nothing
elseif G>=90
    fprintf('A\n')
elseif G>=80
    fprintf('B\n')
elseif G>=70
    fprintf('C\n')
elseif G>=60
    fprintf('D\n')
else
    fprintf('F\n')
end