diff --git a/cpp/char_plus_char_is_int.cpp b/cpp/char_plus_char_is_int.cpp
index d41b64f..dc0867b 100644
--- a/cpp/char_plus_char_is_int.cpp
+++ b/cpp/char_plus_char_is_int.cpp
@@ -9,22 +9,22 @@ VIM-: let g:cf5output=0
 */
 #include <iostream>
 
-char * f( unsigned long ){ return  "unsigned long"; }
-char * f( unsigned int ){ return  "unsigned int"; }
-char * f( unsigned short ){ return  "unsigned short"; }
-char * f( unsigned char ){ return  "unsigned char"; }
-char * f( long ){ return  "long"; }
-char * f( int ){ return  "int"; }
-char * f( short ){ return  "short"; }
-char * f( char ){ return  "char"; }
+const char * f( unsigned long ){ return  "unsigned long"; }
+const char * f( unsigned int ){ return  "unsigned int"; }
+const char * f( unsigned short ){ return  "unsigned short"; }
+const char * f( unsigned char ){ return  "unsigned char"; }
+const char * f( long ){ return  "long"; }
+const char * f( int ){ return  "int"; }
+const char * f( short ){ return  "short"; }
+const char * f( char ){ return  "char"; }
 
 template <typename T>
-char * g() {
+const char * g() {
     return f( T(1) + T(2) );
 }
 
 template <typename T1, typename T2>
-char * h() {
+const char * h() {
     return f( T1(1) + T2(2) );
 }