Compilare: main.cpp: In function 'int main()': main.cpp:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ~^~~~~~~~~~ main.cpp:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<strlen(a)-1&&ok) ~^~~~~~~~~~~~ main.cpp: In function 'int Max(char, char, char)': main.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type] } ^