string.assign
时间: 2023-09-07 15:17:31 浏览: 49
The `string.assign()` function is used to assign a new value to a string. It can be used to replace the entire contents of the string or a portion of it.
Syntax: `string.assign(new_value)`
Example:
```
std::string str = "Hello World!";
str.assign("Goodbye");
// str is now "Goodbye"
str.assign("Hello World!", 5, 5);
// str is now "World"
```
In the first example, the entire contents of the string are replaced with the new value "Goodbye". In the second example, only a portion of the string starting at index 5 and with a length of 5 characters ("World") is replaced with the new value.
相关问题
c++ string.assign
在C++的string库中,assign函数用于将一个字符串赋值给另一个字符串。它的定义如下:
```cpp
basic_string& assign(const basic_string& __str)
```
该函数接受一个常量引用参数__str,将__str的值赋给当前字符串,并返回当前字符串的引用。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [C++string中的assign()、erase()、swap()函数](https://download.csdn.net/download/weixin_38599231/14885010)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT0_1"}}] [.reference_item style="max-width: 50%"]
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[ .reference_list ]
string.assign都做了什么
string.assign()是一个成员函数,用于将一个字符串对象赋值给另一个字符串对象。它会清除当前字符串对象中的所有字符,然后将另一个字符串对象的内容复制到当前字符串对象中。具体来说,它的作用是:
1. 清除当前字符串对象中的所有字符。
2. 复制另一个字符串对象的内容到当前字符串对象中。
3. 返回当前字符串对象的引用。
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