cin.ignore

Question

Can someone explain to me how to use cin.ignore ? thank youu

Answer 1

https://stackoverflow.com/questions/25475384/when-and-why-do-i-need-to-use-cin-ignore-in-c

Answer 2

how to know how much we need to put in the cin.ignore ? for example :-

char name[55];
int id;

int main (){

cout<<" Enter your name : ";
cin.getline(name,54);

cout<<" Enter your ID : ";
cin>>id;

cout<<" Your name is : "<<name<<endl;
cout<<" Your ID is : "<<id;

return 0;
}

if I don't put cin.ignore, the output for ' Your ID is :' will be short

and if I put cin.ignore like this :-

char name[55];
int id;

int main (){

cout<<" Enter your name : ";
cin.ignore(24,'\n');
cin.getline(name,54);

cout<<" Enter your ID : ";
cin>>id;

cout<<" Your name is : "<<name<<endl;
cout<<" Your ID is : "<<id;

return 0;
}

the output will be much worse, both name and id are wrong

can someone explain to me please ?