C++ 字符串连接
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C++ String concatination
提问by backspace
I have realised my mistake. I was trying to concatenate two strings.
我已经意识到我的错误了。我试图连接两个字符串。
Thanks for help!
感谢帮助！
I have just started to c++. I have a problem about string contamination. I don't have problem when I use:
我刚刚开始使用 C++。我有关于字符串污染的问题。我使用时没有问题：
cout <<"Your name is"<<name;
But when I try to do it with string:
但是当我尝试用字符串来做时：
string nametext;
nametext = "Your name is" << name;
cout << nametext;
I got an error. How can I concatenate two strings?
我有一个错误。如何连接两个字符串？
Thanks you!
谢谢！
回答by Creris
For string concatenation in C++, you should use the +operator.
对于 C++ 中的字符串连接，您应该使用+运算符。
nametext = "Your name is" + name;
回答by Vlad from Moscow
First of all it is unclear what type name has. If it has type std::string then instead of
首先，不清楚类型名称有什么。如果它的类型为 std::string 则代替
string nametext;
nametext = "Your name is" << name;
you should write
你应该写
std::string nametext = "Your name is " + name;
where operator + serves to concatenate strings.
其中 operator + 用于连接字符串。
If name is a character array then you may not use operator + for two character arrays (the string literal is also a character array), bacause character arrays in expressions are implicitly converted to pointers by the compiler. In this case you could write
如果 name 是一个字符数组，那么您不能对两个字符数组使用运算符 +（字符串文字也是一个字符数组），因为表达式中的字符数组会被编译器隐式转换为指针。在这种情况下，你可以写
std::string nametext( "Your name is " );
nametext.append( name );
or
或者
std::string nametext( "Your name is " );
nametext += name;
回答by eerorika
nametextis an std::stringbut these do not have the stream insertion operator (<<) like output streams do.
nametext是一个，std::string但它们<<不像输出流那样具有流插入运算符 ( )。
To concatenate strings you can use the appendmember function (or its equivalent, +=, which works in the exact same way) or the +operator, which creates a new string as a result of concatenating the previous two.
要连接字符串，您可以使用append成员函数（或它的等效函数+=，以完全相同的方式工作）或+运算符，它通过连接前两个函数创建一个新字符串。
回答by Georgios
You can combine strings using stream string like that:
您可以使用这样的流字符串组合字符串：
#include <iostream>
#include <sstream>
using namespace std;
int main()
{
string name = "Bill";
stringstream ss;
ss << "Your name is: " << name;
string info = ss.str();
cout << info << endl;
return 0;
}
回答by Minhaj Arfin
nametext = "Your name is" + name;
nametext = "Your name is" + name;
I think this should do
我认为这应该做
