smiley.cpp: In function `int main()': smiley.cpp:14: warning: NULL used in arithmetic smiley.cpp:16: warning: assignment to non-pointer type `char' from NULL smiley.cpp:16: warning: argument to non-pointer type `char' from NULL smiley.cpp:17: warning: char format, different type arg (arg 2) smiley.cpp:18: warning: NULL used in arithmetic smiley.cpp:21: warning: comparison between signed and unsigned integer expressions smiley.cpp:26: warning: comparison between signed and unsigned integer expressions smiley.cpp:28: warning: comparison between signed and unsigned integer expressions smiley.cpp:32: warning: comparison between signed and unsigned integer expressions smiley.cpp:39: warning: assignment to non-pointer type `char' from NULL smiley.cpp:39: warning: argument to non-pointer type `char' from NULL