字符串大小
strlen对char b[ ] = { ‘a’,‘b’,‘c’};不知道 ’\0‘在哪里，读取的是一个字符串

#include <iostream>
using namespace std;
int main()
{
	char a[] = { "abcde" };
	char b[] = { 'a','b','c'};
	cout << sizeof(a)/sizeof(a[0]) << endl;//6
	cout << strlen(a) << endl;//5
	cout << sizeof(a) << endl;//6

	cout << "**************" << endl;

	cout << a[1] << endl;
	cout << b[2] << endl;

	cout << "**************"<< endl;

	cout << sizeof(b) / sizeof(b[0]) << endl;//3
	cout << strlen(b) << endl;//乱码
	cout << sizeof(b) << endl;//3
}