Added Fortran.

Makefile

@@ -24,6 +24,7 @@
 CC=gcc
 CXX=g++
 JAVAC=javac
+FTR=gfortran
 
 # Other commands
 RM=rm -rf
@@ -31,7 +32,7 @@ RM=rm -rf
 # Directories
 BINDIR=bin
 
-all: c cpp java
+all: c cpp fortran java
 
 c:
 	mkdir -p $(BINDIR)
@@ -41,6 +42,10 @@ cpp:
 	mkdir -p $(BINDIR)
 	$(CXX) src/Main.cpp -o $(BINDIR)/doublesgame-cpp
 
+fortran:
+	mkdir -p $(BINDIR)
+	$(FTR) src/main.f -o $(BINDIR)/doublesgame-f
+
 java:
 	mkdir -p $(BINDIR)
 	$(JAVAC) src/DoublesGame.java -d $(BINDIR)

src/main.f

@@ -0,0 +1,40 @@
+C Copyright (C) 2017 Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net> All rights reserved.
+C Author: Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net>
+C
+C This software is provided 'as-is', without any express or implied
+C warranty. In no event will the authors be held liable for any damages
+C arising from the use of this software.
+C
+C Permission is granted to anyone to use this software for any purpose,
+C including commercial applications, and to alter it and redistribute it
+C freely, subject to the following restrictions:
+C
+C 1. The origin of this software must not be misrepresented; you must not
+C    claim that you wrote the original software. If you use this software
+C    in a product, an acknowledgment in the product documentation would be
+C    appreciated but is not required.
+C
+C 2. Altered source versions must be plainly marked as such, and must not be
+C    misrepresented as being the original software.
+C
+C 3. This notice may not be removed or altered from any source
+C    distribution.
+
+      program doublesgame
+          integer :: a,n = 1
+          logical :: run = .TRUE.
+
+          do while(run)
+              write(*,*) '2^', n, '='
+              read(*,*) a
+              if(a .EQ. 0) then
+                  write(*,*) "Goodbye!"
+                  run = .FALSE.
+              elseif(a .NE. 2 ** n) then
+                  write(*,*) "Wrong answer, try again."
+              else
+                  write(*,*) "Correct!"
+                  n = n + 1
+              endif
+          enddo
+      end program doublesgame