Compilare: user.cpp: In function ‘int expresie()’: user.cpp:13:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<a.size() && a[i]!=')'){ ^ user.cpp:40:17: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok=1; ^ user.cpp:58:17: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok=1; ^ user.cpp:67:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok=0; ^ user.cpp:48:13: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok=0; ^ user.cpp:10:9: warning: unused variable ‘t’ [-Wunused-variable] int t=i,r=0,ind=0,ok=0; ^ user.cpp: In function ‘int comparare()’: user.cpp:80:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=0;p<a.size();p++){ ^ user.cpp:88:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=0;p<a.size();p++){ ^ user.cpp:97:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^