调试断言失败c> = -1&&c< = 255 [英] Debug Assertation Failed c >= -1 && c <= 255

问题描述

用我的代码很难理解这个运行时错误.这是我的课上的作业，我认为这很容易，但还有一些奇怪的事情要做.我已经在下面发布了我的代码.

I am having a difficult time understanding this runtime error with my code. This was an assignment for my class that I thought would be easy, but something strange is gong on. I have posted my code below.

进行此分配的提示是创建一个程序，要求用户输入以输入一些单词，然后应输出有多少个单词.我有一个朋友运行该程序，并且可以正常运行，但是，每当我尝试运行该程序时，都会出现此运行时错误.[ http://imgur.com/FcdN3zK ]

The prompt for this assignment was to create a program that asks the user to enter to enter some words, then it should output how many words there are. I have had a friend run the program and it worked, however, whenever I try to run it I get this runtime error. [ http://imgur.com/FcdN3zK ]

请记住，我一般是C ++和编程的初学者，所以我将无法理解非常技术性的回答.预先感谢您的协助.

Please keep in mind that I am a beginner at C++ and programming in general, so I won't be able to understand very technical responses. Thank you in advance for your assistance.

#include <string>
#include <iostream>
#include <cstring>

using namespace std;

int wordCounter(char *);

int main()
{
    char *stringArray = nullptr;
    stringArray = new char[120];

    cout << "Please enter a saying or a phrase that has more than one word: " << endl;
    cin.getline(stringArray, 120);

    int words = wordCounter(stringArray);
    cout << "Your statement contains " << words << " words." << endl;

    system("pause");
    return 0;
}

int wordCounter(char *stringTest)
{
    char characterToTest;
    int numberOfWords = 0;
    for (int i=0; i < 120; i++)
    {
        characterToTest = *(stringTest + i);
        if (isspace(characterToTest) && i != 120)
        {
            char characterToTestTemp = *(stringTest + (i + 1));
            if (isalnum(characterToTestTemp))
            {
                numberOfWords++;
            }
        }
    }
    return numberOfWords;
}

推荐答案

isspace 和朋友很难正确地打电话.具体来说，您不能安全地将 char 传递给它们，因为 char 的值可以为负，并且不允许这样做，如错误消息所述.

isspace and friends are surprisingly hard to call correctly. Specifically you can't safely pass a char to them, because char values can be negative and that is not allowed, as the error message says.

为了安全起见，您应该强制转换为 unsigned char :

You should cast to unsigned char to be safe:

isspace(static_cast<unsigned char>(characterToTest))

这不是这里的主要问题，您需要首先解决溢出问题，但这是您收到错误消息的原因之一.

That isn't the main problem here, you need to fix the overrun first, but it's part of why you're getting the error message.

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