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无符号整形(unsigned) 和 有符号整形(int) 的比较会默认强制转换为 无符号类型(unsigned)

#include <iostream>
using namespace std;

int main()
	int a = -1;
	unsigned int b = 77;
	if (a > b)	//a > b  = true
		cout << "a > b" << endl;
		cout << "a < b" << endl;
	cout << " a = " << a << endl;
	cout << " b = " << b << endl;
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