字符串长度导致数量极大

Question

我计算字符串长度的函数产生了一个非常大的数字，我不知道为什么。

int string_length (char *s)
{
    for(k=0; s[k] != '\0'; k++);
    return k;
}

---

string_length (source);
printf("String length: %d \n", source);

---

Enter string: ew
String length: 1430575920 

应该不使用strlen()。

Answer 1

您不应在此处打印source

printf("String length: %d \n", source);

尝试打印string_length()函数的返回值。例如

size_t ret = string_length (source);/* since predefined strlen() return type is of size_t type, so use size_t as ret type */
printf("String length: %zu \n", ret);

甚至更好

printf("String length: %zu \n", string_length(source));

例如

size_t string_length (char *s) { /*since predefined strlen() return type is of size_t type */
    for(size_t k=0; s[k] != '\0'; k++);
    return k;
}