C Interview Questions and Answers
C is a robust, powerful and fast general-purpose programming language. For fresher developers, C can be an excellent choice to start their programming journey. If you are preparing for the C language job interview, we have one of the biggest collection of C Interview Questions.
It is portable and available on all platforms. A lot of programming language such as PHP, Java, and JavaScript that made their entry after the C language has directly or indirectly borrowed features and syntax /features from it. C++ language is almost an extension of the C language. A lot of recent C programming interview questions were based on this information.
Our unique extensively researched C language interview questions are the best way to prepare for job interviews.
| C Language | |
|---|---|
| What is C language? | C is a general-purpose, procedural computer programming language supporting structured programming, lexical variable scope, and recursion, whilst a static kind machine prevents unintended operations. |
| Latest Version | C18 and released in June 2018 |
| Developed By | Dennis Ritchie & Bell Labs |
| Designed By | Dennis Ritchie |
Most Frequently Asked C Interview Questions
| S.no | Syntax errors | Logical errors |
|---|---|---|
| 1. | Refers to an error in the sequence of characters | Refers to an error in the algorithm |
| 2. | Use compiler to indicate errors | The developer needs to detect an error on his own |
| 3. | Easier to identify errors | Comparatively difficult |
These structures are statements that are used to control the flow and direction of the execution of a program in C. It brings together instructions and logical unit. Control structures have two main classes - conditionals and loops.
There are three different types of control structures are - Selection, Sequence, and Repetition.
C is a robust, powerful and fast general-purpose programming language.C is a robust language with a rich set of built-in features and functions that can be used to build any complex web program. The C compiler has the potential of an assembly language and functionalities of a high-end language.
Why it is used?
Developers can use C language for developing system applications that are forming a huge portion of OS such as Windows, Linux, and UNIX. Most of the OS, C compiler and application programs in UNIX today are written in C.
Dennis Ritchie developed C language in 1972 at Bell Labs
One of the biggest benefits of learning the C language is that it is recognized worldwide and used in hundreds and thousands of applications worldwide, including scientific operating systems. This language combines the features of high end and basic languages. As a result, you can freely use it for starter-level programming as well as high-level programming such as scripting for complex applications.
| S.no | printf() | scanf() |
|---|---|---|
| 1. | Output function | Input function |
| 2. | Prints character, float, integer, hexadecimal and octal, and values | Reads string, character, and numeric data |
| 3. | Rarely needs pointer | Always needs pointer |
| S.no | Local Variable | Global Variable |
|---|---|---|
| 1. | Declared inside function | Declared outside function |
| 2. | Accessed only by statements that are inside a function where they are declared | Accessed by any statement throughout the program |
| 3. | Created when entering function block and gets destroyed when exits. | Stays in existence throughout the when the application is executing |
| 4. | It is stored on the stack. | Stored in a fixed location. |
| S.no | Call By Value | Call By Reference |
|---|---|---|
| 1. | Passing variable values when calling a function is called Call By Values | Passing variable location when calling a function is called Call By Reference |
| 2. | Values of calling function variable to get copied into dummy variables | Address of actual variables get copied into the dummy variables |
| 3. | Changes have no impact on values of actual variables | Changes can manipulate real variables |
| 4. | Cannot alter the values of actual variables | Possible to alter the values of variables |
Recursion is a function that calls itself. It is easy to write in the program, but it requires a lot of memory space and execution time. The advantage of using recursion is that developers can avoid unnecessary calling of functions by substituting with iteration.
C is a robust language with a rich set of built-in features and functions that can be used to build any complex web program. The C compiler has the potential of an assembly language and functionalities of a high-end language. The programs written in this language are robust and efficient, mainly due to its unique data type and strong operators. Much faster than BASIC, it is one of the most widely used languages in OS and embedded system development. On our website, we have provided potential C interview questions.
As a programming language, C is one of the best languages known due to its simplicity of syntax coupled with fantastic functionality. Despite being 40 years old, C language is still trendy. One of the biggest reasons is that the source code written in C works in another OS without a single change. This language is a perfect mix of ease of use with robust features, which makes it an ideal language to be taught to even fresher developers, with an aim to introduce the programming world to them. We can help you prepare for C Interview Questions and Answers by educating you in-depth about this language.
Development History
Initially developed during around 1972 - 1973 at Bell Labs by Dennis Ritchie, mainly for writing OS like UNIX. Some people call it a successor of the B language that was written in the early 1970s. This information is mostly asked during C interview questions.
Latest Version
Many candidates were asked about the features in the latest versions during about their C Programming Interview Questions. C18 is the latest stable version, which was released on June 2018.