131072
2147483647
1
+4
+4
+5
+5
+4
+3
+3
+4
+4
+7
+./arith.tests: 7-- : syntax error: operand expected (error token is " ")
+./arith.tests: --x=7 : attempted assignment to non-variable (error token is "=7 ")
+./arith.tests: ++x=7 : attempted assignment to non-variable (error token is "=7 ")
+./arith.tests: x++=7 : attempted assignment to non-variable (error token is "=7 ")
+./arith.tests: x--=7 : attempted assignment to non-variable (error token is "=7 ")
+4
+7
+-7
+7
+7
+8 12
+./arith.tests: ((: x=9 y=41 : syntax error in expression (error token is "y=41 ")
+./arith.tests: a b: syntax error in expression (error token is "b")
+./arith.tests: ((: a b: syntax error in expression (error token is "b")