Compilare: main.cpp: In function 'bool OR(char*, int&)': main.cpp:21:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(S[pos] == '|' && pos < strlen(S)) ~~~~^~~~~~~~~~~ main.cpp: In function 'bool XOR(char*, int&)': main.cpp:34:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(S[pos] == '^' && pos < strlen(S)) ~~~~^~~~~~~~~~~ main.cpp: In function 'bool AND(char*, int&)': main.cpp:47:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(S[pos] == '&' && pos < strlen(S)) ~~~~^~~~~~~~~~~