C TECHNICAL INTERVIEW QUESTIONS AND ANSWERS FOR FRESHERS PDF
1) How do you construct an increment statement or decrement statement in C? There are actually two ways you can do this. One is to use the. Frequently asked C interview questions with answers and detailed explanations for technical interviews in pdf. Download PDF to practice. The sample questions collected in this book are the most typical ones popular programming languages (C, C++, C#, and Java) are discussed in Chapter 2. . for the behavioral interview, and no difficult technical questions are asked.
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Then no problem we have the right answer to you in in our Wisdomjobs site page . If you are aware with the C and C++ Interview Questions then there are. In a technical interview candidates are likely to be asked questions that: relate to For computer science students, evergreen technical skills are C, C++, UNIX. C Interview Questions and Answers for Freshers or Experienced Pdf. These Questions are frequently asked in all Upcoming Entrance Exams and Bank IBPS .
What is reminder for 5. How many operators are there under the category of ternary operators? There is only one operator and is conditional operator? Which key word is used to perform unconditional branching? Give the general syntax for the same. A pointer holding the reference of the function is called pointer to a function. In general it is declared as follows. Comma operator can be used to separate two or more expressions. A null statement is no executable statements such as ; semicolon.
What is a static function? You would make a function static if it should be called only within the same source code. Which compiler switch to be used for compiling the programs using math library with gcc compiler? Ellipses … is used for the same. Which built-in library function can be used to re-size the allocated dynamic memory? Array is collection of similar data items under a common name.
What are enumerations?
Enumerations are list of integer constants with name. Enumerators are defined with the keyword enum. Which built-in function can be used to move the file pointer internally? Who designed C programming language? Dennis M Ritchie. C is successor of which programming language? American National Standards Institute. Which operator can be used to determine the size of a data type or variable?
Yes, with loss of fractional part. Is a valid octal number?
C And C++ Interview Questions
No, it contains invalid octal digits. What it the return value of a relational operator if it returns any? Return a value 1 if the relation between the expressions is true, else 0. How does bitwise operator XOR works. If both the corresponding bits are same it gives 0 else 1.
What is an infinite loop? If so show an example. Variables belonging to different scope can have same name as in the following code snippet. Local variables get garbage value and global variables get a value 0 by default. Can a pointer access the array? What are valid operations on pointers? What is the built-in function to append one string to another?
Name a function which can be used to close the file stream. What is the purpose of undef preprocessor?
It be used to undefine an existing macro definition. Define a structure. A structure can be defined of collection of heterogeneous data items. Name the predefined macro which be used to determine whether your compiler is ANSI standard or not? What is recursion? Function calling itself is called as recursion. Which function can be used to release the dynamic allocated memory? What is the first string in the argument vector w.
Program name. How can we determine whether a file is successfully opened or not using fopen function? On failure fopen returns NULL, otherwise opened successfully. What is the output file generated by the linker. Linker generates the executable file. What is the maximum length of an identifier? Ideally it is 32 characters and also implementation dependent.
What is the default function call method? By default the functions are called by value. Functions must and should be declared. Comment on this. Function declaration is optional if the same is invoked after its definition. When the macros gets expanded? At the time of preprocessing. Can a function return multiple values to the caller using return reserved word? No, only one value can be returned to the caller. What is a constant pointer? A pointer which is not allowed to be altered to hold another address after it is holding one.
To make pointer generic for which date type it need to be declared? Void Can the structure variable be initialized as soon as it is declared? Yes, w. Is there a way to compare two structure variables?
There is no such. We need to compare element by element of the structure variables. Which built-in library function can be used to match a patter from the string? Strstr What is difference between far and near pointers? In first place they are non-standard keywords. Both the keywords are implementation specific and are non-standard. Can we nest comments in a C code?
No, we cannot. Which control loop is recommended if you have to execute set of statements for fixed number of times? What is a constant? A value which cannot be modified is called so.
Such variables are qualified with the keyword const. Can we use just the tag name of structures to declare the variables for the same? Can the main function left empty? Source codes are codes that were written by the programmer. It is made up of the commands and other English-like keywords that are supposed to instruct the computer what to do. However, computers would not be able to understand source codes.
Therefore, source codes are compiled using a compiler. The resulting outputs are object codes, which are in a format that can be understood by the computer processor.
In C programming, source codes are saved with the file extension. C, while object codes are saved with the file extension. This is a common problem for beginners because quotes are normally part of a printf statement.
It is referred to as a terminating null character, and is used primarily to show the end of a string value. It is used to assign a value to a given variable. The modulus operator outputs the remainder of a division. For example: A nested loop is a loop that runs within another loop.
Put it in another sense, you have an inner loop that is inside an outer loop. In this scenario, the inner loop is performed a number of times as specified by the outer loop. For each turn on the outer loop, the inner loop is first performed.
C Programming Interview Questions
Instead, the operator! Compilers and interpreters often deal with how program codes are executed. Interpreters execute program codes one line at a time, while compilers take the program as a whole and convert it into object code, before executing it.
The key difference here is that in the case of interpreters, a program may encounter syntax errors in the middle of execution, and will stop from there. On the other hand, compilers check the syntax of the entire program and will only proceed to execution when no syntax errors are found. The char keyword can only hold 1 character value at a time. By creating an array of characters, you can store string values in it. While curly brackets are mainly used to group several lines of codes, it will still work without error if you used it for a single line.
Some programmers prefer this method as a way of organizing codes to make it look clearer, especially in conditional statements. Header files are also known as library files. They contain two essential things: Simply put, commands that you use in C programming are actually functions that are defined from within each header files. Each header file contains a set of functions. Syntax errors are associated with mistakes in the use of a programming language. It maybe a command that was misspelled or a command that must was entered in lowercase mode but was instead entered with an upper case character.
A misplaced symbol, or lack of symbol, somewhere within a line of code can also lead to syntax error.
Variables and constants may at first look similar in a sense that both are identifiers made up of one character or more characters letters, numbers and a few allowable symbols. Both will also hold a particular value. Values held by a variable can be altered throughout the program, and can be used in most operations and computations.
Constants are given values at one time only, placed at the beginning of a program. This value is not altered in the program. For example, you can assigned a constant named PI and give it a value 3. You can then use it as PI in the program, instead of having to write 3.
Arrays contain a number of elements, depending on the size you gave it during variable declaration.
C and C++ Interview Questions & Answers
Each element is assigned a number from 0 to number of elements To assign or retrieve the value of a particular element, refer to the element number. Since each header file contains different function definitions and prototype, you would be using only those header files that would contain the functions you will need. Declaring all header files in every program would only increase the overall file size and load of the program, and is not considered a good programming style.
When declaring functions, you will decide whether that function would be returning a value or not. Compound statements are made up of two or more program statements that are executed together. Compound statements can also be executed within a loop. Before a program can be written, an algorithm has to be created first. An algorithm provides a step by step procedure on how a solution can be derived.
It also acts as a blueprint on how a program will start and end, including what process and computations are involved. When storing multiple related data, it is a good idea to use arrays. This is because arrays are named using only 1 word followed by an element number. With arrays, only 1 name is used, the rest are accessible through the index name grade, grade, grade… grade. This is a common mistake for programmers, often leading to logical errors.
Random numbers are generated in C using the rand command. The most probable reason behind this error is that the header file for that function was not indicated at the top of the program. Header files contain the definition and prototype for functions and commands used in a C program. Comments are a great way to put some remarks or description in a program. It can serves as a reminder on what the program is all about, or a description on why a certain code or function was placed there in the first place.
Comments can be a single line, or can even span several lines. It can be placed anywhere in the program. Debugging is the process of identifying errors within a program. During program compilation, errors that are found will stop the program from executing completely. At this state, the programmer would look into the possible portions where the error occurred. Debugging ensures the removal of errors, and plays an important role in ensuring that the expected program output is met.
When using this operator, all conditions specified must be TRUE before the next action can be performed. There is no single command or function in C that can check if a number is odd or even.
However, this can be accomplished by dividing that number by 2, then checking the remainder. If the remainder is 0, then that number is even, otherwise, it is odd. You can write it in code as:. This format is used for two things: The number before the decimal point is for the allotted space, in this case it would allot 10 spaces for the output number.
If the number of space occupied by the output number is less than 10, addition space characters will be inserted before the actual output number.
Program that contains logical errors tend to pass the compilation process, but the resulting output may not be the expected one. This happens when a wrong formula was inserted into the code, or a wrong sequence of commands was performed.
Syntax errors, on the other hand, deal with incorrect commands that are misspelled or not recognized by the compiler. There are 3 main control structures in programming: Sequence, Selection and Repetition. Sequential control follows a top to bottom flow in executing a program, such that step 1 is first perform, followed by step 2, all the way until the last step is performed.
This also means that not all codes may be executed, and there are alternative flows within. Repetitions are also known as loop structures, and will repeat one or two program statements set by a counter. The is also known as the OR operator in C programming. For comparing string values, there is another function called strcmp that deals specifically with strings.
Preprocessor directives are placed at the beginning of every C program. This is where library files are specified, which would depend on what functions are to be used in the program. Another use of preprocessor directives is the declaration of constants. Preprocessor directives begin with the symbol. The outcome will be TRUE. Just the same, s! Order of precedence determines which operation must first take place in an operation statement or conditional statement.
On the top most level of precedence are the unary operators! Instead, use the strcpy function. The correct statement would be: To get the length of a string value, use the function strlen.
For example, if you have a variable named FullName, you can get the length of the stored string value by using this statement: This is because C language is rich in features that make it behave like a high level language while at the same time can interact with hardware using low level methods.
The use of a well structured approach to programming, coupled with English-like words used in functions, makes it act as a high level language. On the other hand, C can directly access memory structures similar to assembly language routines. Source codes in C are saved with.
C file extension. Header files or library files have the. H file extension. Every time a program source code is successfully compiled, it creates an. OBJ object file, and an executable. EXE file. Reserved words are words that are part of the standard C language library. This means that reserved words have special meaning and therefore cannot be used for purposes other than what it is originally intended for.
C Interview Questions PDF and Answers Freshers Experienced
Examples of reserved words are int, void, and return. A linked list is composed of nodes that are connected with another. In C programming, linked lists are created using pointers.
Using linked lists is one efficient way of utilizing memory for storage. In C programming, there is a data structure known as queue. A queue represents a line wherein the first data that was stored will be the first one that is accessible as well.
Read Top C programming interview questions and answers
Binary trees are actually an extension of the concept of linked lists. A binary tree has two pointers, a left one and a right one. Each side can further branch to form additional nodes, which each node having two pointers as well.
All reserved words must be written in lowercase; otherwise the C compiler would interpret this as unidentified and invalid. In the first expression, the increment would happen first on variable a, and the resulting value will be the one to be used.C is the general and basic programming language that will create a base for other programming languages.
C preprocessor Interview Questions. I guide people for the choice of thr Right Career Path as per their Interests. What Is A Void Pointer? Ans The words that are part of the slandered C language library are called reserved words. Such variables are called register variables and are stored in the registers of the microprocessor. Janos Kovacs. Networking Interview Questions?
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