added starter files

.gitignore

@@ -0,0 +1,4 @@
+build/
+*.c
+*.cc
+*.cpp

Makefile

@@ -0,0 +1,21 @@
+
+BUILDDIR = build
+TARGET_SRC = main
+
+build: mkdir main
+all: mkdir main run
+
+mkdir:	# create build directory
+	mkdir -p $(BUILDDIR)
+
+run:	# run binary
+	./$(BUILDDIR)/main
+
+main: lex.yy.c	# compile c file
+	cc $(BUILDDIR)/lex.yy.c -o $(BUILDDIR)/$(TARGET_SRC) -lfl
+
+lex.yy.c: main.lex # generate c file
+	flex -o $(BUILDDIR)/lex.yy.c $(TARGET_SRC).lex
+
+clean: # wipe the build directory
+	rm -f $(BUILDDIR)/*

devbox.json

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+{
+  "packages": [
+    "bison",
+    "flex",
+    "clang"
+  ],
+  "env": {
+    "cc": "clang"
+  },
+  "shell": {
+    "init_hook": null
+  },
+  "nixpkgs": {
+    "commit": "f80ac848e3d6f0c12c52758c0f25c10c97ca3b62"
+  }
+}

main.lex

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+%option noyywrap
+%{
+    #include<stdio.h>
+    #define YYDEBUG 1
+    int yyLineNumber = 1;
+%}
+
+%%
+[a-zA-Z]+        myprint("Identifier"); //matcht auch if und IF!
+IF|if            myprint("keyword");
+\n                yyLineNumber++;
+[ \t]            //nix machen, "spaces und tabs überlesen"
+
+.                myprint("unknown Symbol");
+%%
+
+int main()
+{
+    printf("Programm eingeben: \n");
+    yylex();
+    return 0;
+}
+
+int myprint(char token[]) {
+    printf("\nZeile %d >>> ", yyLineNumber);
+    
+    printf("%s ", token);
+    printf("%s\n", yytext); // yytext: String, der gerade gelesen wurde
+}