Update all syscall

And add PutInt() and GetInt()

code/userprog/consoledriver.h

@@ -18,6 +18,8 @@ class ConsoleDriver:dontcopythis {
     
 	void PutString(const char *s); // Behaves like fputs(3S)
 	void GetString(char *s, int n); // Behaves like fgets(3S)
+    void PutInt(int n);
+    int GetInt();
   private:
 	Console *console;
 };