c - “*s” 和 “s” 变量有什么区别？

Question

如果我有这个变量:

char *s = "house";

如果我在代码的其他部分将其引用为 *s 和 s 有什么区别？

Answer 1

how do I refer to the string as all the characters, not just the first one?

在 C 语言中，代码并不直接引用字符串的所有字符。 char *s 指向单个字符。按照标准 C 库的约定，当该字符开始字符串时，则将 s 视为指向字符串，但仍然只是字符串的第一个字符。通过检查该字符和后续字符(直到并包括空字符)，代码才能了解所有字符串。

char x = *s;  // x assigned the value of the first character pointed to by s.

size_t  len = strlen(s); // len assigned the _length_ of the string 
// Length determined by walking the string until finding a null character '\0'.

// t is assigned the same pointer value as s.  Data they reference is not replicated.
// t and s both point to the same string.
char *t = s; 

char u[strlen(s) + 1];
strcpy(u, s);  // String data pointed to by s is coped to u.

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在 C 中:“字符串是由第一个空字符终止并包含第一个空字符的连续字符序列。”