我正在尝试用C++制作一个基于文本的小游戏，当游戏需要大段文字时，我很难让它看起来美观。我想要统一每行的长度，为了做到这一点，我只能在适当的位置手动输入换行符。是否有命令可以自动实现这个功能？我已经看到了setw()命令，但是如果文本超过宽度，它并不能自动换行。有什么建议吗？以下是我目前正在做的事情，如果有帮助的话。
cout << " This is essentially what I do with large blocks of" << '\n';
cout << " descriptive text. It lets me see how long each of " << '\n';
cout << " the lines will be, but it's really a hassle, see? " << '\n';
编写一个库函数，自动插入适合特定输出宽度的前导空格和换行符是个好主意。本网站认为库推荐不属于讨论范围，但我在下面提供了一些代码 - 不是特别高效，但易于理解。基本逻辑应该是向前跳转到字符串中的最大宽度，然后向后移动，直到找到你准备断开行的空格（或可能是连字符）...然后打印前导空格和剩余部分的行。继续直到完成。
#include <iostream>
std::string fmt(size_t margin, size_t width, std::string text)
{
std::string result;
while (!text.empty()) // while more text to move into result
{
result += std::string(margin, ' '); // add margin for this line
if (width >= text.size()) // rest of text can fit... nice and easy
return (result += text) += '\n';
size_t n = width - 1; // start by assuming we can fit n characters
while (n > width / 2 && isalnum(text[n]) && isalnum(text[n - 1]))
--n; // between characters; reduce n until word breaks or 1/2 width left
// move n characters from text to result...
(result += text.substr(0, n)) += '\n';
text.erase(0, n);
}
return result;
}
int main()
{
std::cout << fmt(5, 70,
"This is essentially what I do with large blocks of "
"descriptive text. It lets me see how long each of "
"the lines will be, but it's really a hassle, see?");
}
这部分代码尚未经过充分测试，但似乎能够工作。您可以在此处查看运行情况。如果需要其他替代方案，请参考这个SO问题。
顺便说一句，您的原始代码可以简化为...
cout << " This is essentially what I do with large blocks of\n"
" descriptive text. It lets me see how long each of\n"
" the lines will be, but it's really a hassle, see?\n";
...由于C++在遇到分号之前会认为语句未完成，因此在代码中相邻出现的双引号字符串字面量会自动连接在一起，就像内部的双引号和空格被删除一样。
void print(const std::string& brute, int sizeline)
{
for(int i = 0; i < brute.length(); i += sizeline)
std::cout << brute.substr(i, sizeline) << std::endl;
}
int main()
{
std::string mytext = "This is essentially what I do with large blocks of"
"descriptive text. It lets me see how long each of "
"1the lines will be, but it's really a hassle, see?";
print(mytext, 20);
return 0;
}
This is essentially
what I do with large
blocks ofdescriptiv
e text. It lets me s
ee how long each of
1the lines will be,
but it's really a ha
ssle, see?
setw()，但我不认为它有效。或者你可以发一个例子来说明如何做到这一点吗？ - Hammurabi8