Subtracting Whole Number from a fraction.

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Hi!

1.At a certain point of calculation when I have a number like this(i.e) -> 3.647 remaining, I need to remove(subtract) 3 so I would have 0.647 for further calculations.

Also I do not know which whole number it would be.

2.How do I get these 3 digits from a price reading ,i.e: 

  0.87130

  How do I get 713 from it for further calculation

Thanks a lot. 

[William Roeder]

t0mbfunk: 1. 3.647 remaining, I need to remove(subtract) 3 so I would have 0.647 for further calculations. 2 0.87130 How do I get 713 from it for further calculation	double v1 = 3.647;  double f1 = v1 - int(v1); // 0.647 double v2 = 0.8713; int    i1 = v2 / 10000;   // 8713                     int    i2 = i1 % 1000;    //  713

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Thank you man