'C++ - error: 'sleep' was not declared in this scope

I started learning programming a few days ago, and today i tried writing a countdown program, but everytime i try to start a program i get error: 'sleep' was not declared in this scope. I searched everywhere for solution but i didn't find it.

#include <iostream>
#include <windows.h>
#include <cstdlib>

using namespace std;

int main()
 {

 for(int i=30; i>=0; i--)

    {
        sleep(1000)
        system("cls")
        cout << i;
    }

    return 0;
 }
c++windows


Solution 1:[1]

Try this out:

this_thread::sleep_for(2s);

Source: https://en.cppreference.com/w/cpp/thread/sleep_for

Solution 2:[2]

sleep is a POSIX (e.g. Linux, macOS) function.

The Windows "sleep" function is Sleep. Note the upper-case S in Sleep.

For a portable solution that is independent of OS then use this_thread::sleep_for instead.

Solution 3:[3]

If your OS is Windows, then use Sleep() instead of sleep() function prototype is in windows.h.

If you are using UNIX use nanosleep() or usleep() and the header name unistd.h.

Solution 4:[4]

Note: If you want to use <unisted.h> instead of <windows.h>.

Put this line in top your code:

unsigned int sleep(unsigned int seconds);

But in response of you cuestion you have to use Sleep() instead of sleep(), notice the uppercase of Sleep().

Sources

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Source: Stack Overflow

Solution Source
Solution 1 yahavi
Solution 2
Solution 3 Kalana
Solution 4

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