Q1 . What are NULL pointers in C?

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SOLUTION

Null pointers do not point to anything.Null can be intialised with Null value

Q2 . What are structures in C?

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SOLUTION

It is a complex data type inside which multiple simple variables can be specified and stored under a common memory and can later be accessed using a structure varaible.Example

struct test{int mark1;}

now to create a structure variable

struct test t

Q3 . What are Unions in C?

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SOLUTION

Unions are like structure but structures have indvidual memory allocation for all its members where as unions have the memory allocated for its largest member.

Q4 . What is the use of typedef in C?

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SOLUTION

Typedef is used to give alias or short names for data types.

typedef long int a

instead of long int we can use a

Q5 . what are the standard input and output functions in C?

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SOLUTION

some of the standard input functions getc,scanf and output functions are printf,putc.

Q6 . What are the file manipulation techniques in C?

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SOLUTION

Files are nothing but a series of bytes of data.

we can open a file using fopen()

we can close the file using fclose()

fscanf() reads data

fprintf() writes data

Q7 . what are macros in C?

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SOLUTION

Macros are named parts of code.we can define it using #define.#define pi 3.14

Q8 . what is Type Casting in C?

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SOLUTION

Typecasting is a way of changing the a variable from a data type to the other

Q9 . Give an example of Type Casting?

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SOLUTION

a=int(d)+c;Here d gets typecasted to the integer data type.

Q10 . Explain error handling in C?

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SOLUTION

C does not have exception handling or handling like some high level languages like java.But we can display some error messages using perror()

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