[Solved] What’s the error in this c++ code?

Question

That’s because you have ; after your while.
The ; causes the while loop to run indefinitely without even getting to:

x=x+10;

You may change your code to

while(x < y) {
    x = x + 10;
    cout << x << " " << y << endl;
}

Accepted Answer

That’s because you have ; after your while.
The ; causes the while loop to run indefinitely without even getting to:

x=x+10;

You may change your code to

while(x < y) {
    x = x + 10;
    cout << x << " " << y << endl;
}