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
In C language, data types mean an extensive system that is used for declaring the functions or variables of different types. The kind of a variable used will determine how much space it will occupy in the storage and how the stored bit pattern will be interpreted.
Some of basic data types in C are:
- Int: For representing numbers (integer)
- Float: For serving numbers with a fraction.
- Double: For representing double-precision floating point value
- Char: Represents single characters
- Void: Shows particular purpose type without a value
This is a typical Embedded C Interview Questions. There are three error types in C language – Runtime, Compile and Logical.
Runtime errors may occur when the program is being run, usually due to illegal operations performed.
Compile errors occur during the compilation of the program. Compile errors are of two types- Syntax and Semantic.
Logical errors occur in the output due to errors in the logic applied in the C program.
| S.no | ++u | u++ |
|---|---|---|
| 1. | Called prefix increment. | Called postfix increment |
| 2. | Increment happens on the variable first. | Increment happens after variable’s value is used. |
The modifier is a prefix for a basic data type that is used for indicating the modification required in the storage space allocated to the variable. A total of five modifiers are available in C programming – Short, Long, Signed, Unsigned, and long. This information is critical for Embedded C Interview Questions.
The main() function is the entry point in C programming language. This function is called by OS the moment a user runs a program. The purpose of this function is crucial because the execution of a C program starts from here. Without the main() function, you cannot execute a program.
Strings are an array of characters that end with a null character (‘\0’). The presence of null character specifies the end of a string. Remember, strings should always be enclosed by double quotes.
Most used functions in the string library are listed below:
- strlen
- strcat
- strchr
- strcpy
- strncat
- strcmp etc
| S.no | Structs | Union |
|---|---|---|
| 1. | Defines a structure | Defines a union |
| 2. | All members get allocated memory | Compiler allocates memory to largest members |
| 3. | Possible to initialize one or more members at once | Gets initialized by the value of the type of the first member |
| 4. | Possible to access individual member any time | Can only access one member at a time. |
| S.no | #include< > | #include" " |
|---|---|---|
| 1. | Compiler searches header files in the standard directory | Compiler searches header files in the current directory |
| 2. | Used for including standard library header files. | Used for including programmer-defined header files. |
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.