Created
May 5, 2020 22:26
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Functional Programming in Erlang
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-module(first). | |
-export([double/1,mult/2,area/3,square/1,treble/1]). | |
mult(X,Y) -> | |
X*Y. | |
square(X) -> | |
mult(X,X). | |
double(X) -> | |
mult(2,X). | |
treble(X) -> | |
mult(3,X). | |
area(A,B,C) -> | |
S = (A+B+C)/2, | |
math:sqrt(S*(S-A)*(S-B)*(S-C)). |
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-module(second). | |
-export([right_hypotenuse/2,right_perimeter/2,right_area/2]). | |
right_hypotenuse(A,B) -> | |
% The hypotenuse (C) of a right triangle comes from Pythagoras' theorem: C^2 = A^2 + B^2, | |
% so C = sqrt (A^2 + B^2) | |
math:sqrt(first:square(A)+first:square(B)). | |
right_perimeter(A,B) -> | |
% The perimeter of any triangle is the sum of the lengths three sides | |
C=right_hypotenuse(A,B), | |
A+B+C. | |
right_area(A,B) -> | |
C=right_hypotenuse(A,B), | |
first:area(A,B,C). |
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This is a perfect solution.
Tip about comments: if you put them outside the function and use a
@doc
tag,edoc
and other tools can later use them better.