The way MATLAB executes a code

Question

Richard 2012-1-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26345-the-way-matlab-executes-a-code

Just wondering... suppose I have a code like

a = 1+2+3;
b = 1+3+5;
c = a+b;
fprintf('%2d',c)

What is MATLAB actually doing? Does it evaluate a before reading the line of code for b, or does it skip over the individual calculations until it reaches the print command which asks for a and b to be evaluated?

In other words, if the code is such that

    a = 1+2+3;
    b = 1+3+5;
    fprintf('%2d',b)

would a get evaluated too and stored somewhere?

Thank you.

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Answer 1

the cyclist 2012-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/26345-the-way-matlab-executes-a-code#answer_34403

MATLAB is a procedural language. It will calculate and store a and b, regardless of later lines of code "needing" them. In the MATLAB editor, you will see a warning that those variables may be unused.