D.6. Example 6 - Matrix Elements. Microware C Compiler

Appendix D. Interfacing to Basic09 bne p1 inc 3,x bne p1 inc 2,x bne p1 inc 1,x p1 andb #$fe turn off sign stb 4,x put B sign byte lda 0,u get C sign byte lsla shift out sign bcc p2 bra if positive orb #$01 turn on sign stb 4,x put B sign byte p2 lda 7,u get C exponent adda #128 less 128 sta 0,x put B exponent p3 clra clear carry

#endasm

}

/* replace cstart.r definitions for BASIC09 */

#asm

_stkcheck:

_stkchec: rts vsect

_flacc: rmb 8 errno: rmb 2 endsect

#endasm

BASIC09 calling program:

PROCEDURE btest

DIM a:REAL

DIM i:INTEGER

DIM cmemory:STRING[32] a=1.

FOR i=1 TO 10

RUN flmult(cmemory,a)

PRINT a

NEXT i

END

D.6. Example 6 - Matrix Elements

The last program is an example of accessing BASIC09 matrix elements. The C program: matmult(cnt,cmemory,cmemsiz,matxaddr,matxsize,scalar,scalsize) char *cmemory; /* pointer to some memory for C use */ int matxaddr[5][3]; /* pointer a double dim integer array */ int *scalar;

{

/* pointer to integer */

#asm ldy 6,s get static memory address

#endasm int i,j; for(i=0; i<5; ++i) for(j=1; j<3; ++j) matxaddr[j][i] *= *scalar; /* multiply by value */

}

#asm

_stkcheck:

_stkchec:

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Appendix D. Interfacing to Basic09 rts vsect

_flacc: rmb 8 errno: rmb 2 endsect

#endasm

BASIC09 calling program:

PROCEDURE btest

DIM im(5,3):INTEGER

DIM i,j:INTEGER

DIM cmem:STRING[32]

FOR i=1 TO 5

FOR j=1 TO 3

READ im(i,j)

NEXT j

NEXT i

DATA 11,13,7,3,4,0,5,7,2,8,15,0,0,14,4

FOR i=1 TO 5

PRINT im(i,1),im(i,2),im(i,3)

NEXT i

PRINT

RUN matmult(cmem,im,64)

FOR i=1 TO 5

PRINT im(i,1),im(i,2),im(i,3)

NEXT i

END

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