C++入门——有符号类型与无符号类型对比

大家好

下面通过一段代码说明有符号型与无符号型的区别

#include 
#define ZERO 0
#include 

int main()
{
	using namespace std;
	short sam = SHRT_MAX;//SHRT_MAX为short的最大取值
	unsigned short sue = sam;

	cout << "sam" << sam << endl;
	cout << "sue" << sue << endl;

	sam = sam + 1;
	sue = sue + 1;
	cout << "sam" << sam << endl;
	cout << "sue" << sue << endl;

	sam = ZERO;
	sue = ZERO;
	cout << "sam" << sam << endl;
	cout << "sue" << sue << endl;

	sam = sam - 1;
	sue = sue - 1;
	cout << "sam" << sam << endl;
	cout << "sue" << sue << endl;

	system("pause");

	return 0;
}

运行结果如下

可见，一旦超过范围，其值将为范围另一端的取值。

即对有符号型：数据从0变化至32767,32767跳变至-32768，-32768再变化至-1，-1跳变至0。

对无符号型：数据从0变化至+65535，+65535跳变至0。