truncating a decimal no. in C++

I wanted to truncate a decimal no in c++
  #include <iostream>
  using namespace std;

 int main()
     float b;
     b = 4.34534;
.I wanted to truncate b to "4".
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In this case you can use floor ():

  float btrunc = floor (b);

The more general case where you truncate to some digits after the decimal point:

 float btrunc = 1. / 1000 * floor ( b * 1000); // this is for 3 digits left replace 1000 with appropriate number for other number of digits.


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