CODEWITHSUNDEEP
c++inputnewlinecin
Arch1tect
Arch1tect

Reputation: 4281

How to ignore the empty line at the end of input

The following code works fine and also check if user has input right amount of items, but it fails when the input has a trailing empty line. 

string item1, item2, item3;
while(cin.good) {

    //this allows me to both check if user input enough items 
    //EDIT: and if items are of right type so I can cerr
    if (cin >> item1 && cin>> item2 && cin>> item3) {

        doStuff(item1,item2,item3);

    }else {

        cerr<<"bad input! Not enough input items or wrong type"<<endl;

    }

}

Can I change cin.good to something else to solve the situation when there is a trailing empty line? I'll accept other solutions too.

EDIT: I realize I can't use while(cin >> item1) because then I can't cerr the error message if item1 is wrong type.

Upvotes: 0

Views: 173

Answers (1)

Xymostech
Xymostech

Reputation: 9850

I think that:

while(cin >> item1) {
    //this allows me to check if user input enough items
    if (cin >> item2 && cin >> item3) {
        doStuff(item1,item2,item3);
    } else {
        cerr<<"bad input! Not enough input items"<<endl;
    }
}

will do what you want.

Upvotes: 2

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