Compilare: user.cpp: In function ‘int main()’: user.cpp:53:10: warning: statement has no effect [-Wunused-value] for(i;i<=lg;i++) ^ user.cpp:8:16: warning: unused variable ‘ok’ [-Wunused-variable] {int t,nr,lg,i,ok,x,k,semn=1,n=0; ^ user.cpp:18:18: warning: array subscript is below array bounds [-Warray-bounds] for(i=0;s[i-1]!='=';i++) ^