3.3.3 其他vector操作-计算平方

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书中页数：P92
代码名称：square.cc

#include <vector>
using std::vector;

#include <iostream>
using std::cout; using std::endl; 

int main()
{
	vector<int> v{1,2,3,4,5,6,7,8,9};
	for (auto &i : v) // for each element in v (note: i is a reference)
		i *= i;           // square the element value
	for (auto i : v)      // for each element in v
		cout << i << " "; // print the element
	cout << endl;

	return 0;
}