Routines 
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The address of this routine is found in the table of addresses. It is called via the calculator literal 39 by the routines at BEEP, FP_TO_BC, LOG_2_A, PRINT_FP, n_mod_m, exp and get_argt. It is also called indirectly via fp_calc_2.
This subroutine handles the function INT X and returns a 'last value' that is the 'integer part' of the value supplied. Thus INT 2.4 gives 2 but as the subroutine always rounds the result down INT 2.4 gives 3.
The subroutine uses truncate to produce I(X) such that I(2.4)=2 and I(2.4)=2. Thus, INT X is given by I(X) when X>=0, and by I(X)1 for negative values of X that are not already integers, when the result is, of course, I(X).


int  13999  RST 40  X  
14000  DEFB 49  duplicate: X, X  
14001  DEFB 54  less_0: X, (1/0)  
14002  DEFB 0  jump_true to X_NEG: X  
14003  DEFB 4  
For values of X that have been shown to be greater than or equal to zero there is no jump and I(X) is readily found.


14004  DEFB 58  truncate: I(X)  
14005  DEFB 56  end_calc  
14006  RET  Finished.  
When X is a negative integer I(X) is returned, otherwise I(X)1 is returned.


X_NEG  14007  DEFB 49  duplicate: X, X  
14008  DEFB 58  truncate: X, I(X)  
14009  DEFB 192  st_mem_0: X, I(X) (mem0 holds I(X))  
14010  DEFB 3  subtract: XI(X)  
14011  DEFB 224  get_mem_0: XI(X), I(X)  
14012  DEFB 1  exchange: I(X), XI(X)  
14013  DEFB 48  f_not: I(X), (1/0)  
14014  DEFB 0  jump_true to EXIT: I(X)  
14015  DEFB 3  
The jump is made for values of X that are negative integers, otherwise there is no jump and I(X)1 is calculated.


14016  DEFB 161  stk_one: I(X), 1  
14017  DEFB 3  subtract: I(X)1  
In either case the subroutine finishes with:


EXIT  14018  DEFB 56  end_calc: I(X) or I(X)1  
14019  RET 
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