Compiler output
prog.cpp: In function ‘int main()’:
prog.cpp:50:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:60:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:72:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:88:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:94:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:100:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp: In function ‘bool op(char)’:
prog.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type]
