字符指针给我一些真正奇怪的字符

问题描述

当我运行示例代码，wordLength是7（因此输出7）。但是我的char数组在它的末尾有一些很奇怪的字符。

When I run the example code, the wordLength is 7 (hence the output 7). But my char array gets some really weird characters in the end of it.

wordLength = word.length();

cout << wordLength;

char * wordchar = new char[wordLength]; //new char[7]; ??

for (int i = 0; i < word.length(); i++) //0-6 = 7
{
    wordchar[i] = 'a';
}

cout << wordchar;

输出：7aaaaaaa²²²||||||D╩2|♀

The output: 7 aaaaaaa²²²²¦¦¦¦¦ÂD╩2¦♀

希望的输出是：aaaaaaa ...什么是垃圾后面？

Desired output is: aaaaaaa... What is the garbage behind it?? And how did it end up there?

推荐答案

您应该添加 \0

char * wordchar = new char[wordLength +1];
//add chars as you have done
wordchar[wordLength] = `\0`

原因是C字符串是空结束的。

The reason is that C-strings are null terminated.

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