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Frequently Asked c interview questions and answers for freshers Page 36

(#M40029330) C QUESTION C Keep an EYE

Q. What is the difference between %d and %*d in c language?

A. %d give the original value of the variable and %*d give the address of the variable.
eg:-int a=10,b=20;
printf("%d%d",a,b);
printf("%*d%*d",a,b);
Result is 10 20 1775 1775 .Here 1775 is the starting address of the memory allocation for the integer.a and b having same address because of contagious memory allocation

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(#M40029329) C QUESTION C Keep an EYE

Q. When should a type cast be used?

A. There are two situations in which to use a type cast. The first use is to change the type of an operand to an arithmetic operation so that the operation will be performed properly. The second case is to cast pointer types to and from void * in order to interface with functions
that expect or return void pointers. For example, the following line type casts the return value of the call to malloc() to be a pointer to a foo structure. struct foo *p = (struct foo *) malloc(sizeof(struct foo));

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(#M40029328) C QUESTION C Keep an EYE

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Q. What are segment and offset addresses?

A. When paging technique is performed, the page will breaks into segments and its sequence is said to be segments and its width can be said as offset. In short,segment is a physical address and offset is logical address

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(#M40029326) C QUESTION C Keep an EYE

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Q. What are the advantages of using Unions?

A. (i) Efficient use of memory as it it does not demand memory space for its all members rather it require memory space for its largest member only.
(ii) Same memory space can be interpreted differently for different members of the union.

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(#M40029325) C QUESTION C Keep an EYE

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Q. What is difference between Structure and Unions?

A. (i) In structure every member has its own memory whereas in union its members share the same member space.
(ii) In structure, it is possible to initialize all the members at the same time which is not
possible in case of union.
(iii) A structure requires more space than union(for the same type of members).
(iv) In union different nterpretations of the same memory space are possible which is not so in case of structures

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(#M40029324) C QUESTION C Keep an EYE

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Q. What are macros? What are its advantages and disadvantages?

A. Macro is a Pre-processor.Major advantage of using the macro is to increase the speed of the execution of the program.
Major disadvantage of the macros are:
(i) No type checking is performed in macro. This may cause error.
(ii) A macro call may cause unexpected results

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(#M40029323) C QUESTION C Keep an EYE

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What are the techniques you use for debugging?

A. (i)Using compiler's features
(ii)Read The Fine Module
(iii)printf( ) debugging
(iv)Code grinding
(v)Assertion

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(#M40029322) C QUESTION C Keep an EYE

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Q. What is a pointer?

A. Pointer is a variable that contains address of another variable in the memory. Pointers are quite useful in creation of linked data structures (such as linked lst, trees graphs), managing object allocated memory dynamically, optimize the program to execute faster and use less memory.

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(#M40029321) C QUESTION C Keep an EYE

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Q. What is a structure?

A. Structure is a collection of heterogeneous (i.e. related data items which can be of different types) held together to a single unit. The data items enclosed within a structure are called its members which may be of data type int, float, char, array etc.

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(#M40029319) C QUESTION C Keep an EYE

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Q. What are library Functions?

A. Library Functions are predefined functions and stored in .lib files.

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