Unit conversion using switch case or else if functions

Question

Melvinder Singh 2020-2-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/505110-unit-conversion-using-switch-case-or-else-if-functions

回答： Srivardhan Gadila 2020-2-17

Im supposed to use the switch case method or the else if method to solve this question. Anyone has any ideas on how to solve this?

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Melvinder Singh 2020-2-12

在 MATLAB Online 中打开

I've managed to come up with this. Ignore the attempt at humor in the code. Is there any easier way to about doing this?

%%%%%%%%%%QUESTION 1%%%%%%%%%%%%
fprintf('Greetings Prof. Wean Sin,\n')
fprintf('Program will ask u to imput a value first followed by units.\n')
fprintf('Please enter units as L, m3, ft3 or gal.\n')
fprintf('Final value will be rounded off to the nearest 2 decimal places.\n')
L=input('Enter the amount of volume:\n');
x=input('Enter your current unit:\n','s');
z=input('Enter your desired unit:\n','s') ;
switch x     %switching current unit and converting to L
    case 'L'
        L=L;
    case 'm3'
        L=L*1000;
    case 'ft3'
        L=L*28.3168;
    case 'gal'
        L=L*3.78541;
    otherwise 
        fprintf('unit is invalid. sad face.\n'); 
end 
switch z     %now converting it to desired vol. unit
    case 'L'
        L=L; 
    case 'm3'
        L=L/1000; 
    case 'ft3'
        L=L/28.3168;
    case 'gal'
        L=L/3.78541;
    otherwise
        fprintf('unit is invalid. sad face.\n');
end
if L<0
    fprintf('error, value is invalid. sad face\n');
else
    fprintf('The volume is %.2f %s \n', L, z);
end

Melvinder Singh 2020-2-12

Like to make it in such a way that I only need to input the starting value and unit together and not separately.

Renato SL 2020-2-13

编辑：Renato SL 2020-2-13

How about making a function (documentation here) instead?

With a function, you can declare every input in one line.

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Answer 1

Srivardhan Gadila 2020-2-17

0
链接

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https://ww2.mathworks.cn/matlabcentral/answers/505110-unit-conversion-using-switch-case-or-else-if-functions#answer_415981

在 MATLAB Online 中打开

For "Like to make it in such a way that I only need to input the starting value and unit together and not separately" you can make use of strsplit, str2num functions as follows:

valuePlusUnit = "45.3245 ft3";
stringSplit = strsplit(valuePlusUnit);
value = str2num(stringSplit(1))
units = stringSplit(2)

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Unit conversion using switch case or else if functions

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Unit conversion using switch case or else if functions

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