law & order

1 files changed, 38 insertions, 0 deletions

diff --git a/03/main.l b/03/main.l
new file mode 100644
index 0000000..f423e7a
--- /dev/null
+++ b/03/main.l
@@ -0,0 +1,38 @@
+%{
+int posint = 0;
+int posfrac = 0;
+int negint = 0;
+int negfrac = 0;
+int errors = 0;
+%}
+
+d [0-9]
+
+%%
+(\+?|-){d}*\.-{d}+ errors++; // invalid numbers
+(\+?|-){d}*\.\+{d}+ errors++; // invalid numbers
+\+?{d}+\/[1-9]{d}* posfrac++;
+-{d}+\/[1-9]{d}* negfrac++;
+(\+?|-){d}+\/{d}+ errors++;
+\+?{d}+ posint++;
+-{d}+ negint++;
+\+?{d}*\.{d}+ posfrac++;
+-{d}*\.{d}+ negfrac++;
+\n ;
+. ;
+%%
+
+int main(void) {
+    yylex();
+    printf("%d positive integers\n"  , posint);
+    printf("%d positive fractions\n" , posfrac);
+    printf("%d negative integers\n"  , negint);
+    printf("%d negative fractions\n" , negfrac);
+    printf("%d errors\n" , errors);
+}
+
+int yywrap()
+{
+    return(1);
+}
+