Compilare: user.cpp: In function ‘int main()’: user.cpp:23:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<bal.size();j++) ^ user.cpp:40:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(isdigit(bal[j])&&j<=bal.length()) ^ user.cpp:61:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==bal.length()&&bal[j]!='x') ^ user.cpp:68:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<jobb.size();j++) ^ user.cpp:85:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(isdigit(jobb[j])&&j<=jobb.length()) ^ user.cpp:106:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==jobb.length()&&bal[j]!='x') ^ user.cpp:12:17: warning: unused variable ‘k’ [-Wunused-variable] int e=1,i,j,k,egy,x,sz=0; ^ user.cpp:15:12: warning: unused variable ‘sol’ [-Wunused-variable] double sol; ^