Update ex9_51.cpp

the second parameter of the function substr( ) shouldn't might less than zero.
MingPap · May 4, 2017 · 4fb1069 · 4fb1069
1 parent 4fad72a
commit 4fb1069
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/ch09/ex9_51.cpp b/ch09/ex9_51.cpp
@@ -45,7 +45,7 @@ wy_Date::wy_Date(const std::string& s)
     case 0x10:
         day = std::stoi(s.substr(0, s.find_first_of("/")));
         month = std::stoi(s.substr(s.find_first_of("/") + 1,
-                                   s.find_first_of("/") - s.find_last_of("/")));
+                                   s.find_last_of("/") - s.find_first_of("/")-1));
         year = std::stoi(s.substr(s.find_last_of("/") + 1, 4));
         break;