多字符字符常量[-Werror,-Wmultichar]
问题描述:
(第43-56行)我试图为pset 5实现加载函数。我创建了一个嵌套的while循环,第一个用于迭代,直到文件的结尾和其他直到每个单词结束。我创建的char * C存放任何“字符串”我是从字典扫描,但是当我编译多字符字符常量[-Werror,-Wmultichar]
bool load(const char *dictionary)
{
//create a trie data type
typedef struct node
{
bool is_word;
struct node *children[27]; //this is a pointer too!
}node;
FILE *dptr = fopen(dictionary, "r");
if(dptr == NULL)
{
printf("Could not open dictionary\n");
unload();
return false;
}
//create a pointer to the root of the trie and never move this (use traversal *)
node *root = malloc(sizeof(node));
char *c = NULL;
//scan the file char by char until end and store it in c
while(fscanf(dptr,"%s",c) != EOF)
{
//in the beginning of every word, make a traversal pointer copy of root so we can always refer back to root
node *trav = root;
//repeat for every word
while ((*c) != '/0')
{
//convert char into array index
int alpha = ((*c) - 97);
//if array element is pointing to NULL, i.e. it hasn't been open yet,
if(trav -> children[alpha] == NULL)
{
//then create a new node and point it with the previous pointer.
node *next_node = malloc(sizeof(node));
trav -> children[alpha] = next_node;
//quit if malloc returns null
if(next_node == NULL)
{
printf("Could not open dictionary");
unload();
return false;
}
}
else if (trav -> children[alpha] != NULL)
{
//if an already existing path, just go to it
trav = trav -> children[alpha];
}
}
//a word is loaded.
trav -> is_word = true;
}
}
错误:
dictionary.c:52:23: error: multi-character character constant [-
Werror,-Wmultichar]
while ((*c) != '/0')
我认为这意味着'/0'
应该是单个字符,但我不我不知道我会如何检查这个词的结尾! 我也收到其他错误消息说:
dictionary.c:84:1: error: control may reach end of non-void function [-Werror,-Wreturn-type]
}
我一直在玩了一段时间,现在,它是令人沮丧的。请帮助,如果您发现任何其他错误,我会很高兴!
''/ 0'' ---->''\ 0'' – rsp
@rsp或者只是0,没有引号,没有混淆。 – cnicutar
或''??/0''(如果你没有'\')。 –