how stdin stream works?

[Flade]

Hi everyone! I'm trying to do error handling (with the try block) 
and when I give a wrong value to the variable (it is an integer 
and I give a non-number value), then It doesn't let me re get 
input. The code:


int x;

bool not_accepted = false;

while (!not_accepted) {

     try {

         write("x: ");

         readf("%d\n", x);

         not_accepted = true;

} catch (Exception msg) {

         writeln("Please give a right coordinate");

     }