C语言第三天 常量类型 || 字符串后加\0

#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>

//常量

//1.define 定义的标识符常量
#define MAX 10

//3.enum 枚举常量
enum Sex {
	MALE,
	FEMALE,
	SECRET
};

int main() {

	//2.const修饰的常变量
	const int num = 4;
	printf("%d\n",num);


	int arr[MAX] = { 0 };
	printf("%d\n", MAX);


	enum Sex s = FEMALE;
	printf("%d\n", s);
	

	return 0;
} 

#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>

int main() {

	//数据在计算机上存储的时候，存储的是二进制

	char arr1[] = "abc";
	char arr2[] = { 'a','b','c','\0'};
	//"abc" -- 'a' 'b' 'c' \0 ---  \0 是字符串的结束标志

	printf("%s\n", arr1);
	printf("%s\n", arr2);

	char arr3[] = "abc";
	char arr4[] = { 'a','b','c' };

	printf("%d\n", strlen(arr3));//长度为3
	printf("%d\n", strlen(arr4));//长度为15


	return 0;
}