c – 为什么相同的类型不同？

发布时间：2020-12-16 10:29:07 所属栏目：百科来源：网络整理

导读：为什么这个(char在我的实现上签名)： cout的std :: is_same char,signed char :: value; 输出错误？解决方法这三种类型在不同时间引入. 来自C99理性： Three types of char are specified: signed ,plain,and unsigned . A plain char may be represented

为什么这个(char在我的实现上签名)：

cout<<的std :: is_same< char,signed char> :: value;

输出错误？

解决方法

这三种类型在不同时间引入.

来自C99理性：

Three types of char are specified:
signed,plain,and unsigned. A plain char may be represented as either signed or unsigned
depending upon the implementation,as in prior practice. The type signed char was
introduced in C89 to make available a one-byte signed integer type on those systems which
implement plain char as unsigned char.

它们必须在C中保持不同的类型,以允许char上的重载是可移植的.

（编辑：李大同）

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