Technical Questions

Q:

What is the difference between the following declarations?

extern int fun();

int fun();

Answer

There is no difference except for the fact that the first one gives a hint that the function fun() is probably in another source file.

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Subject: Programming

0 2219
Q:

What is logical and physical addresses space?

Answer

Logical address space is generated from CPU; it bound to a separate physical address space is central to proper memory management. Physical address space is seen by the memory unit. Logical address space is virtual address space. Both these address space will be same at compile time but differ at execution time.

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Q:

Give a circuit to divide frequency of clock cycle by two?

Answer

You can divide the frequency of a clock by just implementing T Flip flop.


Give clock as clock input and tie the T input to logic 1.

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Subject: Hardware

0 2206
Q:

what is the interrupt?

Answer

interrupt is a signal send by external device to the processor so as to request the processor to perform a particular work.


A signal informing a program that an events has occurred. when a program receives an interrupt signal, it takes a specified action (which can be to ignore the signal).

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Subject: Hardware

0 2203
Q:

What would be the output of the following program?

main()

{

    static int a[20];

    int i = 0;

    a[i] = i++;

    printf ("\n%d%d%d", a[0],  a[1], i);

}

Answer

0  0  1


That's what some of the compilers would give. But some other compiler may give a different answer. The reason is, when a single expression causes the same object to be modified and then inspected the behaviour is undefined.

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Subject: Programming

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Q:

What is fragmentation?

Answer

Fragmentation occurs in a dynamic memory allocation system when many of the free blocks are too small to satisfy any request.

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Q:

What does the EU do?

Answer

Execution Unit receives program instruction codes and data from BIU, executes these instructions and store the result in general registers.

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Subject: Hardware

0 2198
Q:

Point out the error, if any, in the following program.

main()

{

    int ( *p )() = fun;

    ( *P ) ();

}

fun ()

{

    Printf ( "\nLoud and clear" );

Answer

Here we are initalising the function pointer p to the address of the function fun(). But during this initialisation the function has not been defined. Hence an error.


To eliminate this error add the prototype of the fun() before declaration of p, as shown below:


extern int fun();    or simply  int fun();

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Subject: Programming

0 2196