C++中的wrapEndPara功能实现 |21xrx.com

C++中的wrapEndPara功能实现

2023-07-05 02:06:32 深夜i -- --

C++编程语言 wrapEndPara函数段落封装功能实现方法文本编辑器特性

WrapEndPara is a feature in C++ that allows you to wrap a paragraph at the end of a line. This is particularly useful when working with text editors or document formatting programs where you want to create a new line at the end of a paragraph.

To implement WrapEndPara in C++, you need to create a function that takes a string as input and returns a string as output. The function should first find the last space in the string and check if it is at the end of the line. If it is not at the end of the line, the function should find the next space and check if it is at the end of the line. This process should continue until a space is found at the end of the line.

Once the function finds a space at the end of the line, it should insert a newline character (\n) at that position. This will create a new line at the end of the paragraph.

Here is an example implementation of the WrapEndPara function in C++:


std::string wrapEndPara(const std::string& input) {
  std::string output = input;
  std::size_t last_space_index = output.find_last_of(' ');
  while (last_space_index != std::string::npos && last_space_index == output.length() - 1) {
    output.erase(last_space_index);
    last_space_index = output.find_last_of(' ');
  }
  std::size_t next_space_index = output.find_last_of(' ', last_space_index - 1);
  while (next_space_index != std::string::npos && next_space_index == last_space_index - 1) {
    last_space_index = next_space_index;
    next_space_index = output.find_last_of(' ', last_space_index - 1);
  }
  output.insert(last_space_index + 1, "\n");
  return output;
}

To use the WrapEndPara function in your program, you can simply call it with a string argument and it will return a new string with a newline character inserted at the end of the paragraph.

For example:


std::string input = "This is a long paragraph that needs to be wrapped at the end of the line.";
std::string output = wrapEndPara(input);

The output string will contain the same text as the input string, but with a newline character added at the end of the paragraph.

In conclusion, the WrapEndPara feature in C++ is a useful tool for working with text editors and document formatting programs. By implementing a simple function, you can automatically create new lines at the end of paragraphs, making your text easier to read and format.

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