c++ 单引号"字符串" 用法

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__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 */