程序代码：

#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <conio.h>

// 程序入口
int wmain(int argc, wchar_t argv[], wchar_t envp[])
{
    srand(static_cast<unsigned int>(time(NULL)));
    rand();
    for (int i = 0; i < 20; ++i)
    {
        int number = rand();
        if ((number % 2) == 0)
        {
            number *= -1;
        }
        wprintf_s(L"%d\n", number);
    }
    _getwch();
    return EXIT_SUCCESS;
}

程序代码：

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    int i,n;
    srand((unsigned)time(NULL));
    for(i=1;i<=20;i++){
        n=rand();
        if(n%2==0)
            n*=-1;
        printf("%d\n",n);
    }
    return 0;
}