To find variable storing max and min value

I have three variables say a=1 b=2 c=3 i want to find the variable storing minimum and maximum value so how to write the matlab code in matlab function block

[Adam]

If the values are comparable enough for min and max across them to mean something then you should put them all in a single array, then simply return the indices into that array with

[~, idxMin] = min( myArray );
[~, idxMax] = max( myarray );