C ++中的char *和cin [英] char* and cin in C++

问题描述

我想使用cin向char *变量输入一个不确定长度的字符串;

I would like to input a string of indefinite length to a char * variable using cin;

我可以这样做:

char * tmp = "My string";
cout << tmp << endl;
system("pause");

它完美地工作.

但是我无法做到这一点:

But I fail to do this:

 char * tmp
 cin >> tmp;

你能告诉我怎么了"

推荐答案

好，您尚未为char*指向创建对象.

Well, you havn't created an object for the char* to point to.

char* tmp = new char[MAX_LENGTH];

应该使它更好地工作(您必须定义MAX_LENGTH). 另一种方法是:

should make it work better (you have to define MAX_LENGTH). Another way to do this is:

std::string strtmp;
cin >> strtmp;
const char* tmp = strtmp.c_str();

此方法意味着您不需要使用new.

This method would mean that you need not use new.

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