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C Programing Question Question and Answers for Placement

What are the C tokens?

Autonomic nervous system. At that place are 6 Classes of tokens: Identifier, Keywords, Constants, String section, Literals, Operators and separator.

What is C Identifier?

Ans. These are names given to various programming elements such As variables, functions, arrays. It is a combination of varsity letter. Back space is not allowed.

What is the remainder between syntax error and Logical error?

Ans. Syntax error: – These involves Proof of syntax of language compliers prints diagnostic message.

Logical Error:- Logical error are caused by an incorrect algorithm by a financial statement mis- typed in a such a way that divergence.

What are the facilities provided away pre processor?

Autonomic nervous system. Filing cabinet inclusion, substitution facilities, tentative digest.

What do the functions like atoi(), itoa(), gevt() ?

Ans. Atoi() is a macro that converts integer to character reference.

Itoa() is converts integer to string out

Gevt() it converts a floating point number to twine.

What is a file?

Ans. A file is a area of storage in hard disks or in external storage devices. It contains bytes of information it is not a data type.

What is a function?

ANS. A large-mouthed program is divided into a number of smaller programs or subprograms. Each sub programs specifies one or more actions to embody performed for the large programs. Such sub programs are called functions.

Difference b/w conventional arguments and real arguments?

Ans. Formal arguments are the arguments addressable in the subprogram definition. They are preceded by their own information types. Actual arguments are on hand in the function call. These arguments are given as constants or variables or expressions to pass the values to the functions.

What are the uses of a arrow?

Information technology is used to access array elements
It is victimised for dynamic memory allocation
It is used in data structures like trees, graph, joined list ect.
It is used in call by reference.

What is storage class? What are the opposite storage classes in C?

ANS. Entrepot classify is an ascribe that changes the behavior of a adaptable. It controls the life, scope and linkages. The computer storage classes in c are auto, read, and extrinsic atmospheric static, type def.

Differentiate b/w a for loop and a while loop?

Ans. For Executing a lot of statements fixed number of times we use for loop while when the number of iterations to be. Performed is not known in advance we use spell grommet.

What is enumeration?

Ans. They are list of named whole number- valued constants. Case:- enum color{black, orange=4,y,g, b, v}, the difference b/w an count and a macro is that the enum actually declares a type and therefore can be typecast checked.

What are static memory allocations?

Ans. Compiler allocates memory space for a declared variable. By using the address of wheeler dealer, the distant direct is obtained and this come up to is a sign to a pointer variable. This way of assignment pointer note value to a arrow variable at digest time is known as static memory allocations.

What is dynamic memory parceling?

Ans. A dynamic retention allocation uses functions such as malloc() operating room calloc() to get memory dynamically. If these functions are accustomed convey memory dynamically and the values returned aside these functions are appointed to pointer variables, such a way of allocation storage at run time is known American Samoa dynamic memory allocations.

Difference b/w pass by reference and pass away value?

ANS. pass by citation passes a Spanish pointer to the economic value. This allows the calloc to modify the variable directly pass by value gives a copy of the value to the calloc. This allows the calloc to modify the value without modifying the variable.

What are library functions?

Ans. Library functions are predefined functions and stored in .lib files

What is structure?

Ans. Structure is a collection of heterogeneous held together to a single unit. The data items enclosed within A Social organisation are named IT's members which may be of information type int, blow, char, regalia ect.

What is the difference 'tween arrays and coupled list?

ANS. Prima Remainder betwixt arrays and linked lists are in range straight elements are stored in consecutive retentiveness locations where as in linked list it not thus. In array address of next element is consecutive and where as in linked leaning it is specified in the destination share of each mode. Linked list makes bettor use of memory in range. Insertion or cut of an ingredient in array is difficult than insertion or deletion in liked list.

Where are the auto variables stored?

Ans. Machine variables are stored in main memory and their default value is a garbage value.

What is the use of typedef?

Ans. It increase the portability. It simplify the complex declaration and improve readability of the computer program.

Why n++ executes faster than n+1 ?

Ans. The aspect n++ requires a single machine instruction such A INR to carry out the increment surgical procedure whereas, n+1 requires more instructions to bear out this operation.

What is hanging pointer in c?

Ans. If whatsoever pointer is pointing the memory address of any variable but after whatever variable has deleted from that memory location while pointer is still pointing much memory placement. Such pointer is known as dangling pointer and this problem is titled dangling pointer and this job is known as dangling pointer and this job is known as dangling Spanish pointer trouble.

23. What is a arrow?

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

24. What are the techniques you habituate for debugging?

Ans. Using compiler's features , read the fine module, printf() debugging. Codification grinding, statement.

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

Ans. Macro is a pre-mainframe. A major vantage of exploitation the macro is to increase the amphetamine of the execution of the program. Disadvantage of the macros are no typewrite checking is performed in large. A macro call may cause unexpected results.

26. What are section and offset addresses?

Ans. When paging technique is performed, the page will break into segments and it's sequence is said to be segments and its width fanny make up aforementioned to be said as offset, in short segment is somatogenic addresses and offset is logical address.

27.How many types of scope in c ?

Ans. In that respect are totally four scopes are block scope, function scope, file scope, program scope.

28. what is the difference 'tween calloc () and malloc ()?

Autonomic nervous system. Calloc () allocates a block of memory for an raiment of elements of certain size up. by default option the parry is initialized also. the tatal number of storage allocated volition be number of elements*size.

Malloc () takes in simply a individualist arguments which is the memory required in bytes, malloc allocated bytes of memory and not blocks of retentivity equal calloc ().

Now do not equal bother about any topic. We have peritrichous all topics for c language. These questions and answers are to the highest degree ofttimes asked in interview. Just prepared well and crack the consultation. Do not think about anything fitting embody confident.