char 和 string 的相互转换

1. 一个char字符转为string

	char ch = 'A';
    int n = 65;
    string str1 = string(1,n);
    string str2 = string(1,ch);
    cout << str1 << endl;
    cout << str2 << endl;

2. char数组赋给string

	char a[] = "abd";
    string s = a;