Questions

Please answer the following questions, using the preceeding listings:

• How large is segment 2 of DEMO.EXE? _____________

• What is the segment:offset of the 'fgets' routine? _____________

• What is the segment:offset of the symbol 'fpinit'? _____________

• Does DEMO.EXE call DosOpen? ______ How can you tell? _____________

• Which routine begins at address 0001:29DE? _____________

• How long is the routine named 'strlen'? _____________

• Which routine contains address 0001:186A? _____________

• How far into the routine is the previous address? _____________

• What is the program's entry point? _____________

  10.

  What is the name of the routine which is the entry point? ____________
  11.
  What instruction mnemonic is at offset 00C5 in DEMO.EXE? _____________
  12.
  What variable is in AX when the return at 00E0 executes? _____________
  13.
  Which line in DEMO.C generated the above return? _____________
  14.
  Offset 0188 in DEMO.C is in which C function? _____________
  15.
  What variable name is used by the instruction at 0055? _____________
  16.
  What is the purpose of the instruction at offset 0234? _____________

  Note: In the .cod file, the numbers in the assembler instructions are decimal.

  The lines generated in the .cod file between offsets 00E7 and 00E8 Tell you where the local variables are stored, relatively speaking.

  17.
  To what are the numbers like 8, -10, -76, -12 relative? _____________
  18.
  If a failure were to occur in routine 'gen', what command would you use to display only the variable 'npr'? DW _____________
  19.
  How would you display the variable 't'? DW _____________
  20.
  Is the variable 'tp' in 'gen' at the same location as the variable 'nf' in main? Yes / No Explain. __________________________________ _______________________________________________________________________ _______________________________________________________________________
  21.
  Check the offsets for 'gen' and 'main' between the .map and the .cod files. Do they match? _______ Why/why not? ________________ Will the offsets always behave this way? Yes / No
  Explain. _______________________________________________________ ____________________________________________________________________
  

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