Compiler output
prog.cpp: In member function 'int CartInSupermarketEasy::calc(int, int)':
prog.cpp:31:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:40:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:40:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:41:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.cpp:55:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
