sscanf behaviour

In the following piece of code I get as result for f = 123457 instead
of 123456.78. Any ideas how this could have happened?

Thank you

#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
	double f;
	const char *test = "123456.78";
	sscanf(test, "%9lf", &f);
	cout<<f<<endl;
	return 0;
}

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