day-6 代码

char型函数

	char ch1[] = "hello";
	char ch2[] = "Hello";
	char ch3[100];
	int len;

	//copy
	strcpy_s(ch3, ch1);
	cout << "复制后的ch3：" << ch3 << endl;
	cout << "复制后的ch3长度为：" << strlen(ch3) << endl;

	//连接ch2到尾部ch3
	strcat_s(ch3, ch2);
	cout << "复制后的ch3：" << ch3 << endl;
	cout << "连接后的ch3长度为：" << strlen(ch3) << endl;

	//比较ch1和ch2;
	cout << "比较ch1 和 ch2：" << strcmp(ch1, ch2) << endl;
	cout << (int)ch1 << "  " << (int)ch2 << endl;

数组和指针区别

	int var[MAX] = { 10, 100, 200 };
	for (int i = 0; i < MAX; i++)
	{
		cout << i << "   ";
		*var = i;
		
		//var++; //错误
	}
	cout << endl;
	for (int i = 0; i < MAX; i++)
	{
		cout << var[i] << "  ";
	}
	cout << endl;

指针数组

	int var[MAX] = { 10, 100, 200 };
	 
	int(*p)[MAX] = {};
	for (int i = 0; i < MAX; i++)
	{
		(*p)[i] = var[i];
	}

	//var = q;
	for (int i = 0; i < MAX; i++)
	{
		*var = i;
		*(var + i) = i * 10 + 6;
		//var++; //错误
	}
	cout << endl;
	for (int i = 0; i < MAX; i++)
	{
		cout << (*p)[i] << "  ";
	}
	cout << endl;