char数组包含荒谬的字符 [英] char array contains absurd characters

问题描述

void eatSpaces(const char arr[])
{
	char* str = new char[];
	size_t strPosition{}, arrPosition{};
	while (arr[arrPosition] != '\0')
	{
		if (arr[arrPosition] != ' ')
			str[strPosition++] = arr[arrPosition];

		arrPosition++;
	}
	cout << str << endl;
}

void main()
{
	char str[]{"hello world"};
	eatSpaces(str);
}

每次运行此程序时，它会在str []结尾显示2个荒谬的字符。它们就像一些随机生成的角色..

这是第一次显示helloworldφ8

然后， helloworld .C

之后，helloworld├b



不是同样总是..我只是想知道为什么会发生这种情况..没有另一种方法来删除没有这个问题的空间..谢谢..

every time I run this program it shows 2 absurd characters at the end of the str[]. They are like some randomly generated characters..
For the first time, it displays "helloworldφ8"
and then, "helloworld.C"
after that, "helloworld├b"

It isn't same always.. I just want to know why this happens.. Not another way to remove spaces without this problem.. Thanks..

推荐答案

问题是你将字符从 arr 复制到 str ，并在到达空字符时停止（正确）。但是，您忘记在新创建的字符串的末尾添加空字符。它应该是：

The problem is that you copy the characters from arr to str, and stop (correctly) when the null character is reached. However, you forget to add a null character at the end of the newly created string. It should be:

while (arr[arrPosition] != '\0')
{
    if (arr[arrPosition] != ' ')
        str[strPosition++] = arr[arrPosition];

    arrPosition++;
}
str[strPosition] = '\0';  // null terminate the new string

顺便说一下，你使用的是什么编译器，因为在某些语句中有一些奇怪的语法，因此无法在Microsoft的C ++编译器下编译？

By the way, what compiler are you using, as this will not compile under Microsoft's C++ compiler, owing to the strange syntax on some statments?

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