C/C++ pointer movement

In java, getting the length of a string is very simple:

    String str = "wk";
    int len = str.length();
    System.out.println("字符串str的长度为：" + len);

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Then in C/C++, it is realized by pointer movement :

int getLength(char *string); // 函数声明

int main() {

    char *str = "wk";
    int len = getLength(str);
    LOGI("字符串str的长度为：%d", len)

    return 0;
}

/**
 * @return 字符串的长度
 */
int getLength(char *string) {
    int count = 0;
    while (*string) { // string != NULL 则一直循环
        string++; // 指针移动
        count++;
    }
    return count;
}

In the getLength function, a string is received, and the string itself is also a pointer of char type . Because the pointer is at the beginning by default, the length of the string can be calculated by moving the pointer forward with ++ (self-incrementing)

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In C language, pointers (no matter how many levels of pointers) can be moved back and forth by ++ (self-increment) or -- (self-decrement)