C++数据类型

int main()

{

    cout<<"int:"<<sizeof(int)<<endl;

    cout<<"short:"<<sizeof(short)<<endl;

    cout<<"long:"<<sizeof(long)<<endl;

    unsigned
long a;

    cout<<"unsigned int:"<<sizeof(unsignedint)<<endl;

    cout<<"unsigned long:"<<sizeof(unsignedlong)<<endl;

    return 0;

}

无符号整型不能存储负数。

计算中中存储的是补吗，需要按位取反末位加一。