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Frequently Asked c interview questions and answers for freshers Page 37

(#M40029318) C QUESTION C Keep an EYE

output?
Q. What is the use of typedef?

A. (i)It increases the portability.
(ii) It simplify the complex declaration and improve readability of the program.

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(#M40029316) C QUESTION C Keep an EYE

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Q. Difference between arrays and linked list?

A. Major differences between arrays and linked lists are:
(i) In array consecutive elements are stored in consecutive memory locations whereas in linked list it not so.
(ii) In array address of next element is consecutive and whereas in linked list it is specified in the address part of each node.
(iii) Linked List makes better use of memory than arrays.
(iv) Insertion or deletion of an element in array is difficult than insertion or deletion in linked list

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(#M40029315) C QUESTION C Keep an EYE

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Q. Why Preincrement operator is faster than Postincrement?

A. Evaluation of any expression is from left to right. Preincrement is faster because it doesn't need to save the current value for next instruction whereas Postincrement needs to saves current value to be incremented after execution of current instruction.

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(#M40029313) C QUESTION C Keep an EYE

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Q. Where are the auto variables stored?

A. Auto variables are stored in main memory and their default value is a garbage value.

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(#M40029311) C QUESTION C Keep an EYE

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Q. What are merits and demerits of array in c?

A. Merits:
(a) We can easily access each element of array.
(b) Not necessity to declare too many variables.
(c) Array elements are stored in continuous memory location

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(#M40029309) C QUESTION C Keep an EYE

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Q. What is dangling pointer in c?

A. If any pointer is pointing the memory address of any variable but after some variable has deleted from that memory location while pointer is still pointing such memory location. Such pointer is known as dangling pointer and this problem is known as dangling pointer problem.

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(#M40029306) C QUESTION C Keep an EYE

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main( )
{i
nt a[ ] = {10,20,30,40,50},j,*p;
for(j=0; j

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(#M40029274) C QUESTION C Keep an EYE

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Q.
main()
{
extern int i;
i=20;
printf("%d",sizeof(i));
}

A. Linker error: undefined symbol '_i'.

Explanation: extern declaration specifies that the variable i is defined somewhere else. The
compiler passes the external variable to be resolved by the linker. So compiler doesn't find an
error. During linking the linker searches for the definition of i. Since it is not found the linker flags
an error.

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(#M40029273) C QUESTION C Keep an EYE

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Q.
#include
main()
{
struct xx
{i
nt x=3;
char name[]="hello";
};
struct xx *s=malloc(sizeof(struct xx));
printf("%d",s->x);
printf("%s",s->name);
}

A. Compiler Error

Explanation: Initialization should not be done for structure members inside the structure
declaration

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(#M40029267) C QUESTION C Keep an EYE

Q.
main()
{i
nt i=0;
for(;i++;printf("%d",i)) ;
printf("%d",i);
}

A. 1

Explanation: before entering into the for loop the checking condition is "evaluated". Here it
evaluates to 0 (false) and comes out of the loop, and i is incremented (note the semicolon after the for loop).

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