C and c interview questions and answers in pdf format
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Edit Reply. In this article, we will be discussing 30 most asked C programming interview questions during technical interview rounds of various companies. The below given C interview questions range from Easy to Advanced Level.
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?
C Programming Interview Questions
A void pointer is a pointer that can be used to point to any data of any arbitrary type. A void pointer can be dereferenced only after explicit casting. For example:. What is the difference between include " The difference lies in where the preprocessor looks for the file to be included.
For the include directive with a double quoted filename, the preprocessor limits its search for the file to the same directory where the current source file resides, and then to the standard directories pre-designated by the compiler. On the other hand, when the directive uses angle brackets, the preprocessor searches for the file in directories pre-designated by the compiler - usually directories where standard library header files reside.
Dangling pointers are those that point to memory locations which have already been freed. Memory leaks are quite the opposite of dangling pointers. Memory leaks happen when memory locations are not freed, but there is no way to refer to them i.
Unlike higher-level languages with garbage collectors, it is critical to always keep track of allocated memory when programming in C. The statement above declares x as a pointer to a function that takes a single character-pointer argument, and returns a character. The answer is infact undefined , and depends on the compiler being used. Some compilers will result in 16 and 20 , while others will produce 16 and However, macros are processed by the preprocessor, a step that takes place before actual compilation begins.
Expanding the second macro will show what actually gets compiled:. This article discusses this behavior further. The function gets reads characters from the stdin and stores them at the provided input buffer.
However, gets will keep reading until it encounters a newline character. Unless the buffer is large enough, or the length of the line being read is known ahead of time, gets can potentially overflow the input buffer and start overwriting memory it is not supposed to, wreaking havoc or opening security vulnerabilities.
One way to work around this issue is to use fgets. It allows you to put a limit on the maximum number of characters to read:. A struct is a complex data type that allows multiple variables to be stored in a group at a named block of memory. Each member variable of a struct can store different data, and they all can be used at once. For example, you may store an integer in x , and and a character in y above, independent of each other.
A union, on the other hand, stores the contents of any member variable at the exact same memory location. This allows the storage of different types of data at the same memory location.
The result is that assigning a value to one member will change the value of all the other members. Unlike struct, only one member of the union type is likely to be useful at any given time. For example, storing a character in y may automatically change the integer you read from x to something meaningless or unpredictable. The first casting operation properly converts from a floating point number to an integer, as specified by the C standard.
The second conversion, however, is first casting a float pointer to an integer pointer which is then dereferenced to get the final result. This way the compiler is effectively treating raw bits from a float typically stored in IEEE floating point format as if they were bits of an integer.
Although this particular code is unlikely, it demonstrates one of the risks involved in typecasting when only a pointer to the variable to be cast is available. In practice, the pointer must be dereferenced before it is cast.
There is more to interviewing than tricky technical questions, so these are intended merely as a guide. With a bachelor's degree in computer science and math and a master's in computer engineering, Guri possesses a solid academic background along with several years of experience, working on complex projects on embedded devices.
Moreover, he has a strong understanding of the fundamentals of AI and image processing. Guri joined Toptal because he's passionate about working on substantial projects that affect real life. With robust mathematical, problem-solving, and analytical skills and a master's in CS, Nishant is a seasoned technologist with extensive experience building highly available, distributed, large-scale applications and services.
Nishant has also extensively employed genetic algorithms and neural networks to improve trading strategies. Lyubomir is very passionate about solving complex software development problems.
He has a strong interest and proven experience in game development and computer graphics in addition to business applications. He's a fast learner and can quickly adapt to new technologies. Looking for C Developers experts? Submit an Interview Question. What is a void pointer? Can you dereference a void pointer without knowing its type?
View answer. What are dangling pointers? How are dangling pointers different from memory leaks? What is being declared in the following statement? What will be the output when the following code is executed?
Why is it usually a bad idea to use gets? Suggest a workaround. It allows you to put a limit on the maximum number of characters to read: fgets b, , stdin ;. What is the difference between structs and unions? What is the output of the following program if run on a bit operating system?
In a 32 bit operating system, integers are stored as 4 bytes. Enter Your Question Here …. Enter Your Answer Here …. Submit a Question. View Full Profile. Learn more.
50+ Best C Interview Questions
Explore Now! We hope these interview questions and answers are useful and will help you to get the best job in industry. These are top interview questions and answers, prepared by our institute experienced trainers. These questions and answers are suitable for both freshers and experienced professionals at any level. Predefined Data types: Int, char, float and double are the predefined data types User-defined data types: Arrays, Pointers, strings, and structures are user-defined data types. The function is nothing but a collection of a set of statements called function.
The C programming language is a standardized programming language developed in the and depending on the format string it calculated to offset to the actual Visit startexasmuseum.org for more Interview Questions with Answers.
50+ Best C Interview Questions
A void pointer is a pointer that can be used to point to any data of any arbitrary type. A void pointer can be dereferenced only after explicit casting. For example:. What is the difference between include "
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.
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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? The idea is that if the code is in fact correct, you simply remove the comment symbols and continue on.