string Iteration delay by 200ms - c++

Question

Someone can tell me what is wrong with this code?
I want to show 'a' with 200ms delay
eg. number 3 will show after 200ms
numbers 2 and 1 the same, but I can't write correct code to do this.
#include <iostream>
#include <cstdlib>
#include <string>
#include <windows.h>
using namespace std;
int main() {
int a=3;
do {
cout<<a<<endl;
a-=1;
string tekst = a;
for (int i = 0; i < tekst.length(); i++) { // Czasowe pokazanie napisu//
cout << tekst[i];
cout << tekst[i];
Sleep(200);
}
}
while (a=1);
getch();
}

Answer 1

I want to show 'a' with 200ms delay eg. number 3 will show after 200ms numbers 2 and 1 the same, but I can't write correct code to do this.
In that case, your Sleep is misplaced since it's placed after printing. You also do not need to convert the int to a std::string before printing it. ints are perfectly streamable out of the box.
Your do-while loop is also wrong. while (a=1); assigns the value 1 to a so the loop will go on forever since 1 will be implicitly converted to true.
A portable way to sleep 200 ms would be using the std::this_thread::sleep_for() function instead of Sleep() which is not a standard function.
It could look like this:
#include <chrono> // std::chrono::milliseconds
#include <iostream>
#include <thread> // std::this_thread::sleep_for
using namespace std::chrono_literals;
int main() {
for(int a=3; a>0; --a) {
// sleep for 200 ms, the standard way
std::this_thread::sleep_for(200ms);
std::cout << a << std::flush;
// or: std::cout << a << '\n';
}
}
Update for old versions of Dev C++ that doesn't support <thread> and <chrono>:
#include <iostream>
int main() {
for(int a=3; a>0; --a) {
Sleep(200);
std::cout << a << std::flush;
// or: std::cout << a << '\n';
}
}