no user input throw an exception

[Lazysquirell]

i have a program i am working on
int main ()
{
int input=0;
cout <<"pick a number ";
cin>>input ;

}
how do i check to make sure there is a value inputed in from the user and not just the return key pressed. So if only the return key is pressed throw a error or exception, i cannot get it to work.

[LB]

cin's extraction operator will keep waiting for input even if the user simply presses enter. If they enter invalid input, though, it will set cin into a state of error, which you can check and clear.

[Lazysquirell]

so how do what would you suggest?

string in
getline(cin,in);
input=in;
if (in=='10') or '\n'
{some code }

[rocketboy9000]

iostream's handling of newlines is FUBAR.
Get a string somehow, and use sscanf once you have your string.

string in;
int input_value;
getline(cin,in);
if(sscanf(in.c_str,"%d",input_value)==1){
	//do stuff with valid integer input_value
}else{
	//tell the user they didn't put in a good integer.
}

[jonathan3880]

That's really a great information you have posted here. keep it up.