C - sizeof 问题（以 strtok 为特色）

Question

编辑：后来发现这个问题主要是因为我把sizeof搞糊涂了，换成 strlen 几乎是我的解决方案。我的回答（向下滚动）提供了一个不错但简单的例子 strtok 如果你也有兴趣的话。

所以我一直在尝试让一个程序运行，我输入一个用逗号分隔的单词列表，然后它会逐行输出这些单词，并删除所有空格。

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define delim ","

int main() {
    //variable declaration:
    char words[100];
    char *word;
    char tempWord[100];
    int n;

    //gets input assinged to "words":
    puts("\nEnter a list of words separated by commas.\n");
    fgets(words, sizeof(words), stdin);


    //sets up the first word in strtok
    word = strtok(words, delim);

    //loops so long as the word isn't null (reaching the last word)
    while (word != NULL) {
        puts("\n");

        //checks if each character in the word is a space (and ignores them if they are)
        for (n = 0; n < sizeof(word); ++n) {

            //for some reason can't directly use word (probably because it's a pointer)
            //so have to copy it to a temporary value
            strcpy(tempWord, word);

            //don't print if it's a space
            if (!isspace(tempWord[n])) printf("%c", tempWord[n]);
        }

        //moves to next word
        word = strtok(NULL, delim);
    }
    return(0);
}

通过输入 "LETS, FREAKINGG, GOOOOOOOOOOOO"，我似乎遇到了一个问题：

(运行程序):

Enter a list of words separated by commas.

(input) >>>LETS, FREAKINGG, GOOOOOOOOOOOO


LETS

FREAKIN

GOOOOOO

好像是根据第一个单词的大小，给后面的单词设置了不超过3个字符的限制。谁能解释为什么会这样？

Answer 1

谢谢@rici和@kaylum 回复！

由于某种原因，我之前在没有将单词复制到临时变量时遇到了一些错误，我不完全确定将它放在 for 循环中时我在想什么，但没有它就可以工作！只是一个非常小的脑洞...

我相信我的困惑是围绕 sizeof()，用 strlen() 替换是 完整修复为此！

这是修改后的（工作）代码：

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define delim ","

int main() {
    //variable declaration:
    char words[100];
    char *word;
    int n;

    //gets input assinged to "words":
    puts("\nEnter a list of words separated by commas.\n");
    fgets(words, sizeof(words), stdin);


    //sets up the first word in strtok
    word = strtok(words, delim);

    //loops so long as the word isn't null (reaching the last word)
    while (word != NULL) {
        puts("\n");

        //checks if each character in the word is a space (and ignores them if they are)
        for (n = 0; n < strlen(word); ++n) {

            //don't print if it's a space
            if (!isspace(word[n])) printf("%c", word[n]);
        }

        //moves to next word
        word = strtok(NULL, delim);
    }
    return(0);
}

和输出：

Enter a list of words separated by commas.

(input) >>>LETS, FREAKINGG, GOOOOOOOOOOOO


LETS

FREAKINGG

GOOOOOOOOOOOO

非常感谢您的帮助！

C - sizeof 问题（以 strtok 为特色）

C - issues with sizeof (featuring strtok)

c

string

output

size

strtok