类模板(函数模板)

#include <iostream>
using namespace std;

template<typename T>
T abs(T x) {
	return x < 0?-x:x;
}

int main() {
	int n = -5;
	double d = -5.5;

	cout<<abs(n)<<endl;
	cout<<abs(d)<<endl;

	return 0;
}