使用while循环遍历作为C中的参数接收的char数组

I'm still a little new to C, and one hiccup I've been stuck on for the past bit is iterating through a char array received as a parameter. The char array was created as a String literal and passed as an argument. From my understanding this array being received as simply a pointer to the first element in the array; my goal is to loop through each element until reaching the end of the String literal that was passed.

我对C仍然是一个新手，并且我一直坚持过去的一个打嗝是迭代通过作为参数接收的char数组。 char数组创建为String文字并作为参数传递。根据我的理解，这个数组只是一个指向数组中第一个元素的指针;我的目标是循环遍历每个元素，直到到达传递的String文字的末尾。

Since I'm required to perform comparisons of each char to char literals inside the loop, I've assigned the value being pointed at in the array, to a char variable that is being used for the comparisons.

由于我需要在循环内对每个char进行char字符串的比较，因此我已将数组中指向的值分配给用于比较的char变量。

Where I'm having trouble is specifying at what point this loop should end.

我遇到麻烦的地方是指定这个循环应该在什么时候结束。

int main (int argc, char* argv[])
{
    testString("the quick brown fox jumped over the lazy dog");

    return EXIT_SUCCESS;
}

void testString(char line[])
{
    int i = 0;
    int j = 0;
    char ch;
    ch = line[i];

    char charArray[128];

    while (ch != '\0')    // Not sure why this doesn't work
    {   

        if ((ch == '\'' || ch == '-'))
        {
            charArray[j] = ch;
            j++;
        }
        else if (isalpha(ch))
        {
            charArray[j] = ch;
            j++;
        }
        else
        {
             // do nothing
        }

        i++;
        ch = line[i];
    }
}

Thanks in advance for any advice you can offer.

提前感谢您提供的任何建议。

1 个解决方案

#1

The exit condition for your loop is working fine.

你的循环的退出条件工作正常。

The only thing missing is that you need to null terminate charArray after the while loop and print it out:

唯一缺少的是你需要在while循环之后null终止charArray并将其打印出来：

while (ch != '\0')
{
    ...
}
charArray[j] = '\0';
printf("charArray=%s\n",charArray);

#1