update PrintInt and change PutString to PutInt

code/threads/kernel.cc

@@ -308,4 +308,7 @@ int Kernel::CreateFile(char *filename)
 	return fileSystem->Create(filename);
 }
 
-
+void Kernel::PrintInt(int value)
+{
+    return synchConsoleOut->PutInt(value);
+}

code/threads/kernel.h

@@ -42,7 +42,9 @@ class Kernel {
 
     void ConsoleTest();         // interactive console self test
     void NetworkTest();         // interactive 2-machine network test
-    Thread* getThread(int threadID){return t[threadID];}    
+    Thread* getThread(int threadID){return t[threadID];}
+
+    void PrintInt(int n);    
     
     int CreateFile(char* filename); // fileSystem call