3.5 Symbolic Constants
1 Use a TEXTEQU expression to redefine “PROC” as “PROCEDURE.”
答 ：PROCEDURE TEXTEQU < PROC >
2 Declare a symbolic constant using the equal-sign directive that contains the ASCII code (08h) for the Backspace key.
答 ：BACKSPACE = 08h
3 Use TEXTEQU to assign the symbol SetupESI to the following line of code: mov esi,OFFSET myArray
答 ：SetupESI TEXTEQU <mov esi,OFFSET myArray>
4 Declare a symbolic constant named SecondsInDay using the equal-sign directive and assign it an arithmetic expression that calculates the number of seconds in a 24-hour period.
答 ：SecondsInDay = 24 * 60 * 60
5 Show how to calculate the number of elements in the following array, and assign the value to a symbolic constant named ArraySize: myArray DWORD 30 DUP(?)
答 ：ArraySize = ($ - myArray)/TYPE DWORD
6 Write a statement that causes the assembler to calculate the number of bytes in the following array, and assign the value to a symbolic constant named ArraySize: myArray WORD 20 DUP(?)
答 ：ArraySize = ($ - myArray)
7 Use TEXTEQU to create a symbol named Sample for a string constant, and then use the symbol when defining a string variable named MyString.
答 ：
Sample TEXTEQU <“HELLO,WORLD!”>
MyString BYTE Sample