diff --git a/CoreLib/Makefile b/CoreLib/Makefile
index 74159a8..cb74d68 100644
--- a/CoreLib/Makefile
+++ b/CoreLib/Makefile
@@ -5,7 +5,7 @@ BUILD_DIR = ../build/CoreLib
 OBJ_FOLDER = ../bin/CoreLib
 OUTPUTFILE = $(BUILD_DIR)/libCoreLib.a
 
-OFILES = $(OBJ_FOLDER)/memory.o $(OBJ_FOLDER)/path.o $(OBJ_FOLDER)/stack.o $(OBJ_FOLDER)/string.o $(OBJ_FOLDER)/stringview.o
+OFILES = $(OBJ_FOLDER)/ctype.o $(OBJ_FOLDER)/memory.o $(OBJ_FOLDER)/path.o $(OBJ_FOLDER)/stack.o $(OBJ_FOLDER)/string.o $(OBJ_FOLDER)/stringview.o
 
 .phony: all
 all: $(OUTPUTFILE)
@@ -15,6 +15,11 @@ $(OUTPUTFILE): $(OFILES)
 	pwd
 	ar -rc $(OUTPUTFILE) $(OFILES)
 
+
+
+$(OBJ_FOLDER)/ctype.o: ctype.cpp
+	$(CPP) -c ctype.cpp -o $(OBJ_FOLDER)/ctype.o $(CFLAGS)
+
 $(OBJ_FOLDER)/memory.o: Memory.cpp
 	$(CPP) -c Memory.cpp -o $(OBJ_FOLDER)/memory.o $(CFLAGS)
 
diff --git a/CoreLib/ctype.cpp b/CoreLib/ctype.cpp
new file mode 100644
index 0000000..2c81ade
--- /dev/null
+++ b/CoreLib/ctype.cpp
@@ -0,0 +1,141 @@
+//
+// Created by nigel on 25/02/23.
+//
+#include "ctype.h"
+
+int isupper (int ch){
+    if( ch >= 'A' && ch <= 'Z'){
+        return 1;
+    }
+    return 0;
+}
+int islower (int ch){
+    if(ch >= 'a' && ch <= 'z'){
+        return 1;
+    }
+    return 0;
+}
+
+int isalpha (int ch) {
+    if(isupper(ch)){
+        return 1;
+    }
+    if(islower(ch)){
+        return 1;
+    }
+    return 0;
+}
+int isdigit (int ch){
+    if(ch >= '0' && ch <= '9'){
+        return 1;
+    }
+    return 0;
+}
+
+int isxdigit (int ch){
+    if(isdigit(ch)){
+        return 1;
+    }
+
+    if( ch >= 'a' && ch <= 'f'){
+        return 1;
+    }
+
+    if( ch >= 'A' && ch <= 'F'){
+        return 1;
+    }
+    return 0;
+}
+
+int iscntrl (int ch){
+    if(ch >= 0x00 && ch <= 0x1f )
+        return 1;
+    if(ch == 0x7f)
+        return 1;
+    return 0;
+}
+
+
+int isgraph (int ch){
+    if(isdigit(ch))
+        return 1;
+    if(isupper(ch))
+        return 1;
+    if(islower(ch))
+        return 1;
+    if(ispunct(ch))
+        return 1;
+    return 0;
+}
+
+int isspace(int ch){
+    if (ch == 0x20)
+        return 1;
+    if(ch == 0x0c)
+        return 1;
+    if(ch == 0x0a)
+        return 1;
+    if(ch == 0x0d)
+        return 1;
+    if(ch == 0x09)
+        return 1;
+    if(ch == 0x0b)
+        return 1;
+
+    return 0;
+}
+
+int isblank (int ch){
+    if( ch == 0x20 || ch == 0x09)
+        return 1;
+    return 0;
+}
+
+int ispunct(int ch){
+    if(ch >= '!' && ch <= '~')
+        return 1;
+    return 0;
+}
+
+int isprint (int ch){
+    if (isdigit(ch))
+        return 1;
+    if(isupper(ch))
+        return 1;
+    if(islower(ch))
+        return 1;
+    if(ispunct(ch))
+        return 1;
+    if(isspace(ch))
+        return 1;
+
+}
+
+
+int tolower(int ch){
+
+    if(islower(ch)) return ch;
+    int diff = 'a' - 'A';
+    return ch + diff;
+}
+
+int toupper(int ch){
+    if(isupper(ch)) return ch;
+    int diff = 'a' - 'A';
+    return ch - diff;
+}
+
+
+
+int isalnum (int ch){
+    if(isdigit(ch)){
+        return 1;
+    }
+
+   if(isalpha(ch)){
+       return 1;
+   }
+
+    return 0;
+
+}
\ No newline at end of file
diff --git a/CoreLib/ctype.h b/CoreLib/ctype.h
new file mode 100644
index 0000000..43262d6
--- /dev/null
+++ b/CoreLib/ctype.h
@@ -0,0 +1,21 @@
+//
+// Created by nigel on 25/02/23.
+//
+#pragma once
+
+//NOTE: Uses default locale
+int isupper (int ch);
+int islower (int ch);
+int isalpha (int ch);
+int isdigit (int ch);
+int isxdigit (int ch);
+int iscntrl (int ch);
+int isgraph(int ch);
+int isspace(int ch);
+int isblank(int ch);
+int ispunct(int ch);
+int isprint(int ch);
+int isalnum (int ch);
+int tolower(int ch);
+int toupper(int ch);
+