Introduction to C Programming Interview Questions
Preparing for a job interview in C Programming. I am sure you want to know the most common 2020 C Programming interview questions and answers that will help you crack the C Programming interview with ease. Below is the list of top C Programming interview questions and answers at your rescue.
The C Language was developed by Dennis Ritchie at AT & T’s Bell Laboratories in 1972. C is a middle level, procedure-oriented programming language. C is developed for creating system applications that directly interact with hardware devices such as drivers, kernels, etc. C programming is considered as the base for other programming languages, that is why it is known as mother language. It is the base for all other programming languages. It is a System, mid-level programming language. It is a Procedure-oriented programming language. C is simple, versatile, fast and efficient. C is highly portable, a C program can be compiled in any platform that has a C compiler.
The following are the 2020 C Programming Interview Questions that are mostly asked in an interview which are divided into two parts are as follows:
Part 1 – C Programming Interview Questions (Advanced)
Let us now have a look at the Basic C Programming interview questions.
1. What are the different features offered by programming Language C?
Answer:
The different features offered by programming Language C are:
• C is a structured programming language with fundamental flow control construction.
• It is a simple and versatile language
• C has a rich set of operators.
• It has only 32 keywords.
• It is a highly portable programming language.
• It has several predefined functions.
• Programs written in C are efficient and fast.
• C permits all data conversions and mixed-mode operations
• Dynamic memory allocation is possible in C.
• Extensive varieties of data types such as arrays, pointers, structures, and unions are available in C.
• It easily manipulate bits, bytes, and addresses.
• A recursive function is possible in C.
• C compiler combines the capability of an assembly-level language with the features of a high-level language.
2. Why is C Programming Language so popular?
Answer:
C Programming Language is so popular because of the following reasons:
• Programmers can control allocate, deallocate memory
• Using malloc and calloc function memory is allocated statically, automatically or dynamically
• C sits close to the operating system
• It is used widely in operating systems, network drivers, system utilities, language compilers, and language interpreters
3. What is a Null pointer in C?
Answer:
Null is a special reserved value of a pointer in C. Null pointer is different from an uninitialized and dangling pointer.
4. How will you define stack in C?
Answer:
The stack is one form of a data structure. A stack is a data structure that is used to store data in a particular order. Data is stored in stacks using the FILO (First In Last Out) approach. Storing data in a stack also known as a PUSH while data retrieval is referred to as a POP. At any particular instance, only the top of the stack is accessible, which means that in order to retrieve data that is stored inside the stack, those on the upper part should be extracted first.
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5. Write a C program to print: Hello, This is my first program in C?
Answer:
#include <stdio.h>
int main()
{
printf("Hello, This is my first program in C ");
return 0;
}
// printf() displays the string inside quotation
6. What is the major difference between FOR and WHILE loop?
Answer:
The major difference between FOR and WHILE loop are as follows:
• FOR and WHILE loops are entry controlled loops it means test condition is checked for truth while entering into the loop’s body.
• The FOR loop is usually appropriate for loops in which the initialization and increment are single statements and logically related whereas the WHILE loop keeps the loop control statements together in one place.
• FOR loop is used in a more compact case comparing WHILE loop.
Part 2 – C Programming Interview Questions (Advanced)
Let us now have a look at the Advanced C Programming interview questions.
7. What is the difference between the = symbol and == symbol?
Answer:
The difference between the = symbol and == symbol are as follows:
• The = symbol is often used in mathematical operations while == symbol is a relational operator.
• = Symbol is used to assign a value to a given variable while == symbol is used to compare two values.
8. What are the different data types associated with programming Language C?
Answer:
The different data types associated with programming Language C are:
• Int: Integer-Representing number
• Float: Representing Number with a fraction part
• Double: Double-precision floating-point value
• Char: Representing Single character
• Void: Special purpose type without any value
9. What is the difference between ++x and x++?
Answer:
The difference between ++x and x++ are as follows:
++X is called prefixed increment and the increment will happen first on X variable. X++ is called postfix increment and the increment happens after the value of X variable used for the operations.
10. What is a sequential access file?
Answer:
Programs store data into files and retrieve existing data from files only. With the sequential access file such data saved in a sequential pattern. When retrieving data from such files each data needs to read one by one until the required information found.
11. What is a nested loop?
Answer:
A nested loop is a loop that runs within another loop. For example, you can 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. The inner loop is first performed for each turn on the outer loop.
12. What are the differences between static and dynamic library linking?
Answer:
The differences between static and dynamic library linking are as follows:
• Static Linking is the process of copying all library modules used in the program into the final executable image while in Dynamic Linking the names of the external libraries are placed in the final executable file while the actual linking takes place at runtime when both executable file and libraries are placed in the memory.
• Static Linking is performed by programs called linkers as the last step in compiling a program while Dynamic Linking is performed at runtime by the operating system.
• Statically linked files are significantly larger in size while comparing Dynamic Linking files.
• Static Linking consumes more memory and disk space while Dynamic Linking saves memory and space.
• The statically linked program takes constant load time every time it is loaded into the memory for execution while in dynamic linking load time might be reduced if the shared library code is already present in memory.
13. What is the difference between call by value and call by reference in C language?
Answer:
The difference between call by value and call by reference in C language are as follows:
• In call by value, a copy of actual arguments is passed to formal arguments of the called function while in a call by reference, the location (address) of actual arguments is passed to formal arguments of the called function.
• In call by value, actual arguments will remain safe, they cannot be modified accidentally while in a call by reference, alteration to actual arguments is possible within from called function; therefore the code must handle arguments carefully else you get unexpected results.
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