for_each.cpp
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	#include <algorithm>
	#include <iostream>
	#include <numeric>
	#include <vector>

	int main() {
	std::vector<double> v(10);
	std::iota(v.begin(), v.end(), 0);
	std::for_each(v.begin(), v.end(), [](double &x) { x = x * x; });
	std::for_each(v.begin(), v.end(),
	[](double x) { std::cout << x << std::endl; });
	}