How to Convert Fahrenheit to Celsius

function deg_ce = fa_to_ce(deg_f)
deg_ce = (5/9)*(deg_f-32);
fprintf('the temp is %f\n', deg_ce)
end

If i run it, it says that there aren't enough input arguments?

[David Hill]

How are you running it?

c=fa_to_ce(10);

[Rik]

You forgot to tag this as homework. I have just done so for you.

Answer 1

[Pratibha]

temperature = input('Please enter the temperature: ');
units = input('Please enter the units of Temperature (C or F): ','s');

if (units == 'F' || units == 'f')
    converted = (temperature-32)*(5/9);
    convertedto = 'C';
elseif (units == 'C' || units == 'c')
    converted = temperature*(9/5) + 32;
    convertedto = 'F';
else
    fprintf('\nYou have given a wrong input\n')
    fprintf('The program will restart again\n')
    fprintf('----------RESTART - FCF.M ---------   \n\n')
    fcf
end

fprintf('%.2f %s = %.2f %s\n',temperature, upper(units),converted,convertedto)

[Rik]

units = 'fc';
temperature = [3 30];
if (units == 'F' || units == 'f')
    converted = (temperature-32)*(5/9);
    convertedto = 'C';
elseif (units == 'C' || units == 'c')
    converted = temperature*(9/5) + 32;
    convertedto = 'F';
else
    fprintf('\nYou have given a wrong input\n')
    fprintf('The program will restart again\n')
    fprintf('----------RESTART - FCF.M ---------   \n\n')
    fcf
end

Operands to the logical AND (&&) and OR (||) operators must be convertible to logical scalar values. Use the ANY or ALL functions to reduce operands to logical scalar values.

fprintf('%.2f %s = %.2f %s\n',temperature, upper(units),converted,convertedto)

As you can see, your function doesn't fail correctly given a non-scalar input.

Why did you put your function in a script? And why didn't you format your code as code?

[DGM]

switch lower(units) % makes tests case-insensitive
    case {'f','fahrenheit'} % you can support synonymous cases
        % do things
    case {'c','celsius','centigrade'}
        % do things
    otherwise
        error('unknown units %s',units) % error() and warning() are things
end

... would be a start.

[Rik]

And in case of less drastic changes: using strcmp instead of == also solves most issues.

Answer 2

[Bhavani]

disp('This program convert Celsius to Fahrenheit');
Celsius=input('Write a temperature in Celsius and you''ll have the result in Fahrenheit: ');
disp([ 'x = ' num2str(Celsius) ' Celcius and y = ' num2str(Celsius*1.8+32) ' Fahrenheit'])

Answer 3

[Image Analyst]

Your code already works as long as you pass it a value. Observe:

celsius = fa_to_ce(212) % Convert 212 F to C

The temperature is 100.000000 degrees Celsius.

celsius = 100

celsius = fa_to_ce(32) % Convert 32 F to C

The temperature is 0.000000 degrees Celsius.

celsius = 0

function deg_ce = fa_to_ce(deg_f)
deg_ce = (5/9)*(deg_f-32);
fprintf('The temperature is %f degrees Celsius.\n', deg_ce)
end

Your problem was almost certainly that you were just clicking the green Run triangle. If you do that then nothing can possibly get passed in to the argument list and so you get the error you got. You need to call it from a script or the command line and you need to pass in the value in degrees F.

Answer 4

[Kaltum]

how can i use matlab to convert degrees celsius to farenheit

[Walter Roberson]

syms deg_ce deg_f
eqn = deg_ce == (5/9)*(deg_f-32)
solve(eqn, deg_f)

So the formula is 9/5 * deg_ce + 32