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Frequently Asked c interview questions and answers for freshers Page 34

(#M40029360) C QUESTION C Keep an EYE

Q. What is self referential structure ?

A. A self-referential structure is one of the data structures which refer to the pointer to (points) to another structure of the same type.

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(#M40029359) C QUESTION C Keep an EYE

Q. What is function recursion?

A. When a function of body calls the same function then it is called as 'recursive function.'

Example:
Recursion()
{
printf("Recursion !");
Recursion();
}

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(#M40029358) C QUESTION C Keep an EYE

Q. What is difference between declaration and definition?

A. During declaration we just specify the type and no memory is allocated to the variable. But during the definition an initial value is assigned and memory is allocated to the variable.

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(#M40029357) C QUESTION C Keep an EYE

Q. What is prototype of printf function?

A. Prototype of printf function is:
int printf( const char *format ,…)

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(#M40029356) C QUESTION C Keep an EYE

Q. What is slack byte in structure?

A. To store any type of data in structure there is minimum fixed byte which must be reserved by memory. This minimum byte is known as word boundary. Word boundary depends upon machine. TURBO C is based on 8086 microprocessor which has two byte word boundary. So any data type reserves at least two byte space.

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(#M40029355) C QUESTION C Keep an EYE

Q. what is nested structure?

A. A structure is a collection of one or more variables, possibly of different data types, grouped together under a single name for convenient handling. Structures can contain other structures as members; in other words, structures can nest

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(#M40029353) C QUESTION C Keep an EYE

Q. What is command line argument?

A. Getting the arguments from command prompt in c is known as command line arguments. In c main function has three arguments.
They are:
Argument counter
Argument vector
Environment vector

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(#M40029352) C QUESTION C Keep an EYE

Q. What are differences between sizeof operator and strlen function?

A. sizeof is keyword of c which can find size of a string constant including null character but strlen is function which has been defined string.h and can find number of characters in a string excluding null character

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(#M40029351) C QUESTION C Keep an EYE

Q. What is automatic type promotion in c?

A. In c if two operands are of different data type in a binary operation then before performing any operation compiler will automatically convert the operand of lower data type to higher data type. This phenomenon is known as automatic type conversion.

For example:
int a=10,c;
float b=5.5f;
c=a+b;
Here a int variable while b is float variable. So before performing addition operation value of the variable a (Lower data type) will automatically convert into float constant (higher data type) then
it will perform addition operation.

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(#M40029350) C QUESTION C Keep an EYE

Q. Tell any five properties of auto variables?
A. Auto variables are defined inside a function. A variable declared inside the function without storage class name is, by default, an auto variable. These functions are declared on the stack. The stack provides temporary storage

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