Compilare: main.cpp: In function 'int evaluare(char*)': main.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(token);i++) ~^~~~~~~~~~~~~~ main.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(token) && isdigit(token[i])) ~^~~~~~~~~~~~~~ main.cpp: In function 'int aplica(int, int, char)': main.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type] } ^