减缓for循环的速度

Question

for(;;) {
    int rand_number = rand() % 2;
    cout << rand_number;
}

这些循环会在屏幕上像电影《黑客帝国》一样生成1和0（哈哈），但是代码执行非常快，有没有办法让数字出现得慢一些？

- Kamran

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你知道外层循环的其余部分永远不会执行吗？ - Niklas B.

是的，你说得对，但我之前有迭代器，然后我把它移除了，忘记排除外部循环了。 - Kamran

Answer 1

使用 Sleep(3000); 命令等待 3000 毫秒

#include <iostream>
#include <stdlib.h>
#include <Windows.h>

using namespace std;

int main(int argc,char**argv){
    cout<<"a"<<endl;
    Sleep(3000);
    cout<<"b"<<endl;

    return 0;
}

- Nurlan

Answer 2

看看 usleep。你也可以使用 sleep，但我认为那会太慢。

USLEEP(3)                BSD Library Functions Manual                USLEEP(3)

NAME
     usleep -- suspend thread execution for an interval measured in microseconds

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     usleep(useconds_t useconds);

DESCRIPTION
     The usleep() function suspends execution of the calling thread until either useconds microseconds have elapsed or a signal is delivered to the thread whose action
     is to invoke a signal-catching function or to terminate the thread or process.  The actual time slept may be longer, due to system latencies and possible limita-
     tions in the timer resolution of the hardware.

     This function is implemented, using nanosleep(2), by pausing for useconds microseconds or until a signal occurs.  Consequently, in this implementation, sleeping
     has no effect on the state of process timers and there is no special handling for SIGALRM.

RETURN VALUES
     The usleep() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

ERRORS
     The usleep() function will fail if:

     [EINTR]            A signal was delivered to the process and its action was to invoke a signal-catching function.

SEE ALSO
     nanosleep(2), sleep(3)

HISTORY
     The usleep() function appeared in 4.3BSD.

BSD                            February 13, 1998                           BSD

- RC.

Answer 3

如果你只想让它停下来直到你准备好，你可以输入一个随意的无意义的cin。它会一直等待输入，直到你按回车键。

- babno