c++ 单引号"字符串" 用法

    __int64 flag;

    //赋值超过4字节,编译错误
    //flag = 'ABCDE';

    //低于4字节,高位补 0
    //flag = 'BCDE';

    flag = 'A' << 24 + 'B' << 16 + 'C' << 8 + 'D';
    //加运算 结果为 0
    flag = 'A' << 24 | 'B' << 16 | 'C' << 8 | 'D';
    //或运算的结果 等同 flag = 'ABCD';
    flag <<= 32;
    flag |= 'EFHI';
    cout << flag << endl;
    cout << std::hex << flag << endl;
    char * array = (char *)&flag;
    char buff[9] = { 0 };
    strncpy(buff, array, sizeof flag);
    cout << buff << endl;
    getchar();

    return 0;

     /*
         输出结果
         4702394921427290185
         4142434445464849
         IHFEDCBA
    */