Example: Rounds x downward (float)

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public static int main (string[] args) {
	// Output:
	//	``floorf (3.1f) = 3.0f``
	//	``floorf (3.9f) = 3.0f``
	print ("floorf (%.1lff) = %.1lff\n", 3.1f, Math.floorf (3.1f));
	print ("floorf (%.1lff) = %.1lff\n", 3.9f, Math.floorf (3.9f));
	return 0;
}

 valac --pkg glib-2.0 -X -lm GLib.Math.floorf.vala

See:

• GLib.Math.floorf

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