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Practice Assignment for Future Learn Functional Programming with Erlang Course.
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-module(assignment). | |
-export([perimeter/1,area/1,bits/1,tests/0]). | |
%Perimeter functions for circle,rectangle, square | |
perimeter({circle, {_X,_Y}, R}) -> | |
2*math:pi()*R; | |
perimeter({rectangle,H,W}) -> | |
2*H + 2*W; | |
perimeter({square,L}) -> | |
math:pow(L,2); | |
%Perimeter of right triangle and triangle | |
perimeter({right_triangle,A,B}) -> | |
A + B + math:sqrt(math:pow(A,2) + math:pow(B,2)); %calculating the hypotenuse | |
perimeter({triangle,A,B,C}) -> | |
case is_valid(A,B,C) of %check if triangle is valid | |
false -> | |
io:format("Invalid Triangle"); | |
true -> | |
A+B+C | |
end. | |
% Area of right triangle and simple triangle | |
area({right_triangle,A,B}) -> | |
A*B/2; | |
area({triangle,A,B,C}) -> | |
case is_valid(A,B,C) of %check if triangle is valid | |
false -> | |
io:format("Invalid Triangle"); | |
true -> | |
S = (A+B+C)/2, | |
math:sqrt(S*(S-A)*(S-B)*(S-C)) | |
end. | |
%function to check validity of triangle | |
is_valid(A,B,C) when A+B>C, B+C>A, C+A>B -> | |
true; | |
is_valid(_A,_B,_C) -> | |
false. | |
% Tail recursive definition for converting to binary | |
convert_to_binary(0,List) -> | |
List; | |
convert_to_binary(N,List) when N>0 -> | |
R = N rem 2, | |
convert_to_binary(N div 2,[R|List]). | |
convert_to_binary(N) -> | |
convert_to_binary(N, []). | |
% using the sum function of lists module to sum the integers in the list | |
bits(N) -> | |
lists:sum(convert_to_binary(N)). | |
test_bits() -> | |
2 = bits(3), | |
3 = bits(7), | |
1 = bits(8), | |
pass. | |
test_perimeter() -> | |
31.41592653589793 = perimeter({circle, {0,0}, 5}), | |
22 = perimeter({rectangle,6,5}), | |
25.0 = perimeter({square, 5}), | |
12.0 = perimeter({right_triangle, 3,4}), | |
12 = perimeter({triangle,3,4,5}), | |
pass. | |
test_area() -> | |
6.0 = area({right_triangle,3,4}), | |
6.0 = area({triangle,3,4,5}), | |
pass. | |
tests() -> | |
pass = test_perimeter(), | |
pass = test_area(), | |
pass = test_bits(), | |
pass. |
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