https://blog.csdn.net/weixin_43828245/article/details/90180568
Usage: getline (cin, str); // cin is fixed in front of, behind str variable name must be a string type
https://blog.csdn.net/weixin_43828245/article/details/90180568
Usage: getline (cin, str); // cin is fixed in front of, behind str variable name must be a string type