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CS401 Current Final Term Papers Fall 2019 (15 to 26 February 2020) & All Solved Past Papers, Solved MCQs & Helping Material

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CS401 Final Term Short Notes

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30% mcqs from moaz file

2 short and 2 long also from moaz file

2 from handout

What is Stack overflow
Answer:- (Page 187)
The strong argument in favour of callee cleared stacks is that the arguments were placed on the stack for the
subroutine, the caller did not needed them for itself, so the subroutine is responsible for removing them.
Removing the arguments is important as if the stack is not cleared or is partially cleared the stack will
eventually become full, SP will reach 0, and thereafter wraparound producing unexpected results.

Who is responsible for removing the parameter from the stack when we call a function in C and Pascal?
Answer:- (Page 187)
In C the caller removes the parameter while in Pascal the callee removes them. The C scheme has reasons
pertaining to its provision for variable number of arguments.

28. DOS allocate memory for program execution and then de-allocate , explain memory management in
DOS (5 marks)
Answer:- (Page 121)
At physical address zero is the interrupt vector table. Then are the BIOS data area, DOS data area, IO.SYS,
MSDOS.SYS and other device drivers. In the end there is COMMAND.COM command interpreter. The
remaining space is called the transient program area as programs are loaded and executed in this area and the
space reclaimed on their exit. A freemem pointer in DOS points where the free memory begins. When DOS
loads a program the freemem pointer is moved to the end of memory, all the available space is allocated to it,
and when it exits the freemem pointer comes back to its original place thereby reclaiming all space. This action
is initiated by the DOS service 4C. The second method to legally terminate a program and give control back to
DOS is using the service 31. Control is still taken back but the memory releasing part is modified. A portion of
the allocated memory can be retained. So the difference in the two methods is that the freemem pointer goes
back to the original place or a designated number of bytes ahead of that old position.

Cs401k paper me 1 question aaya tha k How to convert 2D video screen in 1D video memory? Tell the formula
Kisi ko aata ye?

CS401 Computer Architecture and Assembly Language Programming Current Papers Final Term Fall 2019


Current Paper CS401.

20MCQS past se 5 number ka question aya tha physical adress find krna tha baki tamam unit se tora tora aya mid term se b 10 number ka paper aya 2 question hello world program lkna tha 15/16/17 se aya tha bs.

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