C语言字符串

一、字符串就是字符数组

二、字符串的结束标志是’\0’

int main()
{
	char arr1[] = "hello";
	char arr2[] = {'a','b','c'};
	char arr3[] = {'a','b','c','\0'};
	printf("%s\n",arr1); //hello
	printf("%s\n",arr2); //abc烫烫烫烫烫烫烫烫烫烫烫烫烫烫蘟bc
	printf("%s\n",arr3); //abc
	
	return 0;
}

三、‘\0’仅仅只是字符串的结束标志，字符串长度并不包含‘\0’

int main()
{
	int len = strlen("abc");
	printf("%d\n",len); //3

	return 0;
}

四、不加’\0’的字符串的长度是随机值

int main()
{
	char arr1[] = "hello";
	char arr2[] = {'a','b','c'};
	char arr3[] = {'a','b','c','\0'};
	printf("%d\n",strlen(arr1)); //5
	printf("%d\n",strlen(arr2)); //随机值
	printf("%d\n",strlen(arr3)); //3
	
	return 0;
}