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
The pointer is nothing but a variable that stores and points the address or location of a different variable. While a regular variable stores the value of a variable, a pointer variable stores the address or location of a variable.
Why it is used?
You can use pointers in a C program for getting the location of a variable, or for achieving pass by call reference. This is because pointers allow various functions to modify and share the local variables. You can also use a pointer for implementing “linked” data structures, such as lists and binary trees. Have you read our rest of the Interview Questions on C?
It is the allocation of memory at the time of compilation before the associated program gets executed. Unlike dynamic or automatic memory allocation, where memory gets allocated as required at run time, this type of memory gets allocated by the compiler at the time of compilation.
| S.no | malloc() | calloc() |
|---|---|---|
| 1. | Does not initialize allocated memory | Fills allocated memory with zero bits. |
| 2. | Returns one single object | Returns array of objects |
Structures are a collection of various data items of different data-types. Like an array, each member in a structure is located next to each other.
Yes, it is possible to compile a program in C without the main function, but it will not get executed. This is because the execution starts only from the main function. This function is the entry point of every program in C. All pre-defined or user-defined functions are directly or indirectly called through the main function.
Certain reserved words in C, which are known and understood by the compiler are called keywords. The meaning of these keywords is already known to the compiler. Keywords are always written in small case letters, and cannot be used as the names of variables as that may change their meaning. Some of the standard keywords are – auto, case, break, float, extern, etc.
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.