多线程实现变色龙

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <Windows.h>
#include <process.h>
#include <time.h>

void timeset(void *p)//线程的main函数
{
    int i = 0;
    while (1)
    {
        i++;
        char str[100] = { 0 };
        sprintf(str, "title 当前时间第%d秒", i);
        system(str);
        Sleep(1000);
    }

    
}

void colorall(void *p)
{
    time_t ts;
    unsigned int num = time(&ts);
    srand(num);

    for (;;)
    {
        int num1 = rand() % 16;
        Sleep(10);
        int num2 = rand() % 16;
        char str[50] = { 0 };
        sprintf(str, "color %x%x", num1, num2);//%x 转化成十六进制
        system(str);
    }
}

void main()
{
    _beginthread(timeset, 0, NULL);
    _beginthread(colorall, 0, NULL); 

    system("color 3f");
    system("pause");
}