Compiler output
prog.cpp: In function ‘int main()’:
prog.cpp:24:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:25:22: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null]
prog.cpp:47:22: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null]
prog.cpp:83:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:86:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:90:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:106:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
