如何在串口中生成随机负整数和正整数的文件？

I want a file of randomly generated positive or negative serial integers. For now, I ask the file contain roughly (no guarantee required) equal numbers of negative and positive, but make it easy to change the proportions later. By "serial", I mean the kth random negative is equal to -k, and the kth random positive is equal to +k.I want a file of randomly generated positive or