Get value from function to be used in program

2016 4 2
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更新时间：2016 4 2
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Hello,
I wrote a simple function program called ADD:
function A = ADD(N,M);
A = N + M
return
and this is the main program:
N = 10;
M = 30;
ADD(N,M);
sin(2*pi*A);
When I run the main program, I get the error that says "Undefined function or variable 'A' ".How do I go about making the value from the ADD function available to the main program? I have both the function and main program in the same folder.
Thanks for your help!

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