Why cin.getline() does not work here ?

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class AbC
{
public:
	void SetData()
	{			
		cout<<"Enter Text : ";
		std::cin.getline(Text,29);		
		cout<<"Enter Age : ";
		cin>>Age;
	}
public:
	char Text[30];
	float Age;
};
void main()
{
	int x;
	std::cin>>x;// when write this statment i can not insert text with cin.getline() , and when i delete this statment cin.getline() work

	AbC obj;
	obj.SetData();

}

Posted 4-Jun-13 7:44am

Anderso0on

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CPallini 4-Jun-13 14:39pm

It works on my system (Windows 8, Visual Studio 2012).
Did you press ENTER after inserting x?

Anderso0on 4-Jun-13 14:58pm

i use Windows 8, Visual Studio 2012 and it does not work

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Santhosh G_ · Answer 1 · 2013-06-04T08:39:00

Solution 1

After cin>>x, input stream contains new line character.
getline read input stream to until a new line character found.

C++

std::cin.getline(Text,29);

returns because it found the remaining '\n' character in the input stream.

After cin>>x, clear the input stream by the following code, and getline will work.

C++

int x;
	std::cin>>x;
std::cin.ignore(std::cin.rdbuf()->in_avail()); // clear the input stream

Posted 4-Jun-13 8:39am

Santhosh G_

Comments

Anderso0on 4-Jun-13 14:54pm

please explain what is going on in the code ?

Santhosh G_ 4-Jun-13 15:01pm

For getline, The delimiting character is the newline character ('\n'). If a pending '\n' in input stream,cin then getline immediately returns.
After cin>>x the '\n' is remained in the input stream.
http://www.cplusplus.com/reference/istream/istream/getline/