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Interview Questions And Answers In C Programming Pdf

interview questions and answers in c programming pdf

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Top 100 C Programming Interview Questions & Answers

C is a mid-level and procedural programming language. The Procedural programming language is also known as the structured programming language is a technique in which large programs are broken down into smaller modules, and each module uses structured code. This technique minimizes error and misinterpretation. More details. C is known as a mother language because most of the compilers and JVMs are written in C language. It introduces new core concepts like arrays, functions, file handling which are used in these languages.

C is called a mid-level programming language because it binds the low level and high -level programming language. We can use C language as a System programming to develop the operating system as well as an Application programming to generate menu driven customer driven billing system. Following are the differences between a call by value and call by reference are:.

When a function calls itself, and this process is known as recursion. The function that calls itself is known as a recursive function. Winding phase : When the recursive function calls itself, and this phase ends when the condition is reached. Unwinding phase : Unwinding phase starts when the condition is reached, and the control returns to the original call. An Array is a group of similar types of elements. It has a contiguous memory location. It makes the code optimized, easy to traverse and easy to sort.

The size and type of arrays cannot be changed after its declaration. A pointer is a variable that refers to the address of a value. It makes the code optimized and makes the performance fast. Whenever a variable is declared inside a program, then the system allocates some memory to a variable. The memory contains some address number. The variables that hold this address number is known as the pointer variable. The above syntax tells that p is a pointer variable that holds the address number of a given data type value.

When we assign a '0' value to a pointer of any type, then it becomes a Null pointer. A pointer which can access all the 16 segments whole residence memory of RAM is known as far pointer. A far pointer is a bit pointer that obtains information outside the memory in a given section. In the above example, initially memory is allocated to the pointer variable ptr, and then the memory is deallocated from the pointer variable.

Now, pointer variable, i. The problem of a dangling pointer can be overcome by assigning a NULL value to the dangling pointer. Let's understand this through an example:. In the above example, after deallocating the memory from a pointer variable, ptr is assigned to a NULL value.

This means that ptr does not point to any memory location. Therefore, it is no longer a dangling pointer. In case of a pointer to pointer concept, one pointer refers to the address of another pointer. The pointer to pointer is a chain of pointers. Generally, the pointer contains the address of a variable.

The pointer to pointer contains the address of a first pointer. Let's understand this concept through an example:. In the above example, pptr is a double pointer pointing to the address of the ptr variable and ptr points to the address of 'a' variable.

In the above example, the value of a and b gets corrupted, and only variable ch shows the actual output. This is because all the members of a union share the common memory space. Hence, the variable ch whose value is currently updated. In C, every local variable of a function is known as an automatic auto variable. Variables which are declared inside the function block are known as a local variable. The local variables are also known as an auto variable.

It is optional to use an auto keyword before the data type of a variable. If no value is stored in the local variable, then it consists of a garbage value. The sprintf stands for "string print. It transfers the data to the buffer.

It returns the total number of characters present in the string. But, if we use define, we can compile and run a C program without using the main function. For example:. The Token is an identifier. It can be constant, keyword, string literal, etc. A token is the smallest individual unit in a program. C has the following tokens:. The argument passed to the main function while executing the program is known as command line argument.

The getch function reads a single character from the keyboard. It doesn't use any buffer, so entered data will not be displayed on the output screen. The getche function reads a single character from the keyword, but data is displayed on the output screen.

In the above example, the value entered through a getch function is not displayed on the screen while the value entered through a getche function is displayed on the screen. A near pointer doesn't have explicit selector whereas far, and huge pointers have explicit selector. When you perform pointer arithmetic on the far pointer, the selector is not modified, but in case of a huge pointer, it can be modified. These are the non-standard keywords and implementation specific.

These are irrelevant in a modern platform. The typecasting is a process of converting one data type into another is known as typecasting. If we want to store the floating type value to an int type, then we will convert the data type into another data type explicitly. The fopen function is used to open file whereas fclose is used to close file. Yes, by holding the base address of array into a pointer, we can access the array using a pointer.

JavaTpoint offers too many high quality services. Mail us on hr javatpoint. Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. All Interview. C Programming Interview Questions A list of 50 top frequently asked C programming interview questions and answers are given below. Dennis Ritchie. The main features of C language are given below: Simple: C is a simple language because it follows the structured approach, i.

Mid Level: C is a mid-level programming language as it combines the low- level language with the features of the high-level language. Structured: C is a structured language as the C program is broken into parts. Fast Speed: C language is very fast as it uses a powerful set of data types and operators. Memory Management: C provides an inbuilt memory function that saves the memory and improves the efficiency of our program.

Extensible: C is an extensible language as it can adopt new features in the future. Following are the differences between a local variable and global variable: Basis for comparison Local variable Global variable Declaration A variable which is declared inside function or block is known as a local variable. A variable which is declared outside function or block is known as a global variable. Scope The scope of a variable is available within a function in which they are declared.

The scope of a variable is available throughout the program. Access Variables can be accessed only by those statements inside a function in which they are declared. Any statement in the entire program can access variables. Life Life of a variable is created when the function block is entered and destroyed on its exit. Life of a variable exists until the program is executing.

Storage Variables are stored in a stack unless specified. The compiler decides the storage location of a variable. Following are the uses of a static variable: A variable which is declared as static is known as a static variable. The static variable retains its value between multiple function calls. Static variables are used because the scope of the static variable is available in the entire program.

So, we can access a static variable anywhere in the program. The static variable is initially initialized to zero. If we update the value of a variable, then the updated value is assigned. The static variable is used as a common value which is shared by all the methods.

C Programming Tricky Interview Questions

C is a mid-level and procedural programming language. The Procedural programming language is also known as the structured programming language is a technique in which large programs are broken down into smaller modules, and each module uses structured code. This technique minimizes error and misinterpretation. More details. C is known as a mother language because most of the compilers and JVMs are written in C language. It introduces new core concepts like arrays, functions, file handling which are used in these languages.

C programming Interview questions and answers

It is referred to as a terminating null character and is used primarily to show the end of a string value. Answer: Break is used to control out of the block of code which is executing, we can use in loop statements or switch statements. Answer: The main function in c is the one which executes which you run the program but it is not the first function to be executed as there is another start function which gets executed to compile the libraries.

There are actually two ways you can do this. Likewise, the statement "x --" means to decrement the value of x by 1. When using Call by Value, you are sending the value of a variable as parameter to a function, whereas Call by Reference sends the address of the variable. Also, under Call by Value, the value in the parameter is not affected by whatever operation that takes place, while in the case of Call by Reference, values can be affected by the process within the function. How does this aid in debugging?

Top C Programming Interview Questions you Need to Master in 2021

Dear readers, these C Programming Interview Questions have been designed specially to get you acquainted with the nature of questions you may encounter during your interview for the subject of C Programming. It de-refers twice to point to the data held by the designated pointer variable. By default every local variable of the function is automatic auto. Break can appear only with in the looping control and switch statement. The purpose of the break is to bring the control out from the said blocks.

C programming language was developed at Bell Laboratories in Programming language is nothing but a language designed to communicate to machines through instructions and commands. Normally machines are computers.

What is a pointer? A pointer is a special variable, which stores the memory address. Ampersand in front of a variable gets its address and asterisk in front of a pointer gets its value.

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    Download PDF. 1) How do you construct an increment statement or decrement statement in C? There are actually two ways you can do this.

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    Important C interview questions with answers. What is a pointer? What is null pointer? Define function pointer? What is volatile variable? Difference between global and static variable? What are the files automatically opened when C file is executed? Compare between array and pointer. Define function prototype?

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