have a simple one-pass macro processor like the upose thed in Section 4.1. Now y

Question

have a simple one-pass macro processor like the upose thed in Section 4.1. Now you want to add a built-in func %SIZEOF to the macro processor. This function can be arameters, and returns the number of bytes occu- dd by the corresonding argument. Consider, for exampl following program: START0 MACRO &FROM;,&TO; MOVE LENGTH SET IF LDCH STCH %SIZEOF ( &FROM;) (&LENGTH; EQ 1) &FROM; &TO; IDX #&LENGTH; LDS LDT #TO JSUB MOVERTN ENDIF MEND #FROM FIRSTMOVEA, B C,D MOVE RESB1 RESB1 RESB 500 RESB500 END hrstinvocation of MOVE, %SZEOF(A) returns 1; in the sec- hus the macro invocations would be OF(C) returns 500. T expanded as follows:

Explanation / Answer

this function first comares if the length is 1 then returns same

else it continues till it has found an end to the variable and then return its size unttill then keeps subtracting 1 on each loop

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