In file included from /usr/include/c++/3.2.2/backward/fstream.h:31, from balls.cpp:1: /usr/include/c++/3.2.2/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <sstream> instead of the deprecated header <strstream.h>. To disable this warning use -Wno-deprecated. balls.cpp: In function `char* del(char*, int, int)': balls.cpp:43: warning: comparison between signed and unsigned integer expressions balls.cpp: In function `char* insert_ball(char*, char, int)': balls.cpp:65: warning: comparison between signed and unsigned integer expressions balls.cpp:68: warning: comparison between signed and unsigned integer expressions balls.cpp: In function `char* NtoA(long int)': balls.cpp:118: warning: comparison between signed and unsigned integer expressions balls.cpp:119: warning: comparison between signed and unsigned integer expressions balls.cpp: In function `int main()': balls.cpp:160: warning: comparison between signed and unsigned integer expressions balls.cpp:163: warning: comparison between signed and unsigned integer expressions balls.cpp:126: warning: unused variable `long int nrc'