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 ]

How many levels of indirection in pointers can you have in a single declaration?

1026

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What is an array? What the different types of arrays in c?

1104

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What happens if a header file is included twice?

985

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What's the difference between constant char *p and char * constant p?

1089

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What are valid signatures for the Main function?

1170

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What is %s and %d in c?

973

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What is difference between %d and %i in c?

1181

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How do we declare variables in c?

1008

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1018

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What are qualifiers?

976

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Write the syntax and purpose of a switch statement in C.

1039

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What is bss in c?

1045

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How can I change the size of the dynamically allocated array?

1092

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What is the difference between c and python?

1104

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a) Identify the following declarations. Ex. int i (integer variable) float a[l0](array of 10 real nos) int (*f())() void *f int (*f()) [] void *f int f[] [] [] char *(*f) () int (*f[]) [] float(*f) [] [] float **f int ******f

2079

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