sleep() does not work ? 0.1 second wait in the while loop I could not handle

[burcin erek]

#include <iostream>
#include <conio.h>
using namespace std;
main()
{
int a,b;
b=50;
cout<<"enter a value less than 50: ";
cin>>a;
do
{
cout<<"A number: "<<a<<endl;
a++;
Sleep(100);
}
while (a<=b);
getch();
return 0;
}

[Stefano Mtangoo]

what does not work means?
It is very general term. Please say exactly what does not work. Errors, et al

[LevyDee]

You need to include Windows.h

[burcin erek]

thank you exact answer.

[Stefano Mtangoo]

next time post error! error like one below helps than "it doesn't work"
double for.cpp:16: error: 'sleep' was not declared in this scope