Answer Posted / abi

Yes there are differences between a null pointer and a void
pointer. As you know that a pointer holds the memory address
of any variable . So we can say for a null pointer that :

- A null pointer can be of any primitive type(e.g - int *
,char * etc)

-However a null pointer does not point to any memory
location , i.e. it does not contain a reference of any
variable/value. Hence we may state that it has a NULL as its
value making it a null pointer.

Where as in case of a void pointer we can say :

- void pointer is always of type void *

- Mainly such pointers are used for dynamic memory
allocations (using malloc(), calloc() and realloc()
functions) , where memory block reserved is pointer to by a
void pointer and as the pointer value is returned it has to
be explicitly type casted to a particular desired type.

for e.g

int * ptr;

ptr=(int *) malloc(sizeof(int));

[ Here malloc () returns a pointer of void * type(i.e a void
pointer) which is type casted to int * as per our requirement ]

Is void a keyword in c?

986

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Draw a flowchart to produce a printed list of all the students over the age of 20 in a class .The input records contains the name and age of students. Assume a sentinel value of 99 for the age field of the trailer record

5203

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What is call by reference in functions?

1432

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In C language, the variables NAME, name, and Name are all the same. TRUE or FALSE?

1222

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Explain how can I pad a string to a known length?

1189

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What is the equivalent code of the following statement in WHILE LOOP format?

1295

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1006

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Why do we need a structure?

1037

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Under what circumstances does a name clash occur?

1198

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Why structure is used in c?

1186

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What is the difference between typedef and #define?

1050

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Tell me when would you use a pointer to a function?

1049

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void main(){ int a; a=1; while(a-->=1) while(a-->=0); printf("%d",a); }

1720

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What is identifier in c?

1007

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How can I split up a string into whitespace-separated fields?

1052

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