Compilare: user.cpp: In function ‘int main()’: user.cpp:39:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(expresie); ++i) { ^ user.cpp: In function ‘double rezolva()’: user.cpp:102:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘double transformare(char)’: user.cpp:105:12: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] double r; ^ user.cpp: In function ‘int main()’: user.cpp:53:53: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] double op = transformare(expresie[i]); ^