Compilare: user.cpp: In function ‘int eval(int, int, char)’: user.cpp:12:32: warning: control reaches end of non-void function [-Wreturn-type] if(o=='/')return a / b;} ^ user.cpp: In function ‘int main()’: user.cpp:29:48: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets( S, NX, fopen( "evaluare.in", "r" ) ); ^