CIN determines the type of data entered

In the process of data input using CIN operations, there are often situations where the defined data types do not match the data types of the keyboard input, so how do you solve this problem? Here's a simple example,

#include <iostream>

using namespace Std;

int main (int argc,char **argv)

{

Long x;//here defines a long type of variable X

cin>>x;

while (Cin.fail ())

{

Cin.clear ();//reset flag to reset all state values in the stream cin to a valid state

cout<< "The type of data type does not match the defined data type, please re-enter";

Cin.ignore (9999, ' \ n '); empty last input

cin>>x;//re-enter X

}

return 0;

}

CIN determines the type of data entered