diff --git a/include/libabacus.h b/include/libabacus.h
index 5880b76..e1fe1a8 100644
--- a/include/libabacus.h
+++ b/include/libabacus.h
@@ -48,7 +48,26 @@ libab_result libab_init(libab* ab);
  * @param func the function that describes the functionality of the operator.
  * @return the result of the initialization.
  */
-libab_result libab_register_operator(libab* ab, const char* op, int precedence, libab_function_ptr func);
+libab_result libab_register_operator_infix(libab* ab, const char* op, int precedence, libab_function_ptr func);
+/**
+ * Registers an operation with libabacus that appears
+ * before its operand.
+ * @param ab the libabacus instance to register the operator with.
+ * @param op the operator string to register.
+ * @param func the function that describes the functionality of the operator.
+ * @return the result of the registration.
+ */
+libab_result libab_register_operator_prefix(libab* ab, const char* op, libab_function_ptr func);
+/**
+ * Registers an operation with libabacus that appears
+ * after its operand.
+ * @param ab the libabacus instance to register the operator with.
+ * @param op the operator string to register.
+ * @param func the function that describes the functionality of the operator.
+ * @return the result of the registration.
+ */
+libab_result libab_register_operator_postfix(libab* ab, const char* op, libab_function_ptr func);
+
 /**
  * Registers a function with libabacus.
  * @param ab the libabacus instance used to keep state.
diff --git a/include/table.h b/include/table.h
index 780c0d3..2862cc2 100644
--- a/include/table.h
+++ b/include/table.h
@@ -30,8 +30,8 @@ struct libab_table_s {
 enum libab_table_entry_variant_e {
     ENTRY_VALUE,
     ENTRY_TYPE,
-    ENTRY_OPERATOR,
-    ENTRY_FUNCTION
+    ENTRY_OP,
+    ENTRY_FUN
 };
 
 /**
diff --git a/src/libabacus.c b/src/libabacus.c
index 778a52e..b0dba88 100644
--- a/src/libabacus.c
+++ b/src/libabacus.c
@@ -1,5 +1,6 @@
 #include "libabacus.h"
 #include <stdlib.h>
+#include "util.h"
 
 libab_result libab_init(libab* ab) {
     libab_table_init(&ab->table);
@@ -7,33 +8,50 @@ libab_result libab_init(libab* ab) {
     return libab_lexer_init(&ab->lexer);
 }
 
-libab_result libab_register_operator(libab* ab, const char* op, int precedence, libab_function_ptr func) {
+libab_result _register_operator(libab* ab, const char* op, int token_type, int precedence, libab_function_ptr func) {
     libab_result result = LIBAB_SUCCESS;
     libab_table_entry* new_entry;
     if((new_entry = malloc(sizeof(*new_entry)))) {
-        new_entry->variant = ENTRY_OPERATOR;
+        new_entry->variant = ENTRY_OP;
         new_entry->data_u.op.function = func;
         new_entry->data_u.op.precedence = precedence;
     } else {
         result = LIBAB_MALLOC;
     }
 
+    if(result == LIBAB_SUCCESS) {
+        result = libab_convert_lex_result(eval_config_add(&ab->lexer.config, op, token_type));
+    }
+
     if(result == LIBAB_SUCCESS) {
         result = libab_table_put(&ab->table, op, new_entry);
     }
 
     if(result != LIBAB_SUCCESS) {
+        eval_config_remove(&ab->lexer.config, op, token_type);
         free(new_entry);
     }
 
     return result;
 }
 
+libab_result libab_register_operator_infix(libab* ab, const char* op, int precedence, libab_function_ptr func) {
+    return _register_operator(ab, op, TOKEN_OP_INFIX, precedence, func);
+}
+
+libab_result libab_register_operator_prefix(libab* ab, const char* op, libab_function_ptr func) {
+    return _register_operator(ab, op, TOKEN_OP_PREFIX, 0, func);
+}
+
+libab_result libab_register_operator_postfix(libab* ab, const char* op, libab_function_ptr func) {
+    return _register_operator(ab, op, TOKEN_OP_POSTFIX, 0, func);
+}
+
 libab_result libab_register_function(libab* ab, const char* name, libab_function_ptr func) {
     libab_result result = LIBAB_SUCCESS;
     libab_table_entry* new_entry;
     if((new_entry = malloc(sizeof(*new_entry)))) {
-        new_entry->variant = ENTRY_FUNCTION;
+        new_entry->variant = ENTRY_FUN;
         new_entry->data_u.function.function = func;
     } else {
         result = LIBAB_MALLOC;
diff --git a/src/table.c b/src/table.c
index 23af601..e14918d 100644
--- a/src/table.c
+++ b/src/table.c
@@ -17,7 +17,7 @@ libab_table_entry* table_search(libab_table* table, const char* string) {
 libab_operator* libab_table_search_operator(libab_table* table, const char* string) {
     libab_table_entry* entry = table_search(table, string);
     libab_operator* to_return = NULL;
-    if(entry && entry->variant == ENTRY_OPERATOR) {
+    if(entry && entry->variant == ENTRY_OP) {
         to_return = &entry->data_u.op;
     }
     return to_return;
@@ -25,7 +25,7 @@ libab_operator* libab_table_search_operator(libab_table* table, const char* stri
 libab_function* libab_table_search_function(libab_table* table, const char* string) {
     libab_table_entry* entry = table_search(table, string);
     libab_function* to_return = NULL;
-    if(entry && entry->variant == ENTRY_FUNCTION) {
+    if(entry && entry->variant == ENTRY_FUN) {
         to_return = &entry->data_u.function;
     }
     return to_return;