Fixed some things.

src/grammar.y

@@ -27,6 +27,8 @@
 %token RGROUP
 %token SEP
 
+%token EXPSEP
+
 %token<strval> WORD
 %token<fval> NUM
 
@@ -50,6 +52,7 @@
 input:
     %empty
     | exp { root = $1; }
+    | input EXPSEP exp { root = $3; }
     ;
 
 

src/lexer.c

@@ -112,6 +112,7 @@ int yylex() {
         case '(':  return LGROUP;
         case ')':  return RGROUP;
         case ',':  return SEP;
+        case ';': return EXPSEP;
         default:   fprintf(stderr, "Unexpected character: %c\n", c);
     }
 

test/validation/test.bats

@@ -82,3 +82,16 @@ bin() { ./scl.out $1 | tail -n1; }
     run bin "-(-(1+2)*3)"
     [ "$output" = "= 9.000000" ]
 }
+
+@test "multiple expressions per line" {
+    run bin "1+1;2"
+    [ "$output" = "= 2.000000" ]
+}
+
+@test "variable definition" {
+    run bin "x = 1"
+    [ "$output" = "= 1.000000" ]
+
+    run bin "x = 1; x + 1"
+    [ "$output" = "= 2.000000" ]
+}