Technical interview questions and answers are essential for clearing a C Language Interview because C is the foundation of all modern programming languages. C interviews typically include questions related to pointers, loops, functions, arrays, memory allocation, structures, and file handling. Whether you are preparing for campus placements or software development roles, companies such as TCS, Wipro, Infosys, Cognizant, and Accenture frequently test your C programming basics. This guide includes the most frequently asked C Language interview questions with clear explanations to help freshers and job seekers build strong conceptual understanding. Learning these questions will help you perform confidently in coding rounds, written tests, and technical interviews.
C programmers should advance their skills by learning C++ programming and mastering data structures for algorithm development
Showing 10 of 130 questions
121. What would be the equivalent pointer expression foe referring the same element as
a[p][q][r][s] ?
*( * ( * ( * (a+p) + q ) + r ) + s)
122. Are the variables argc and argv are always local to main?
Yes they are local to main.
123. Can main () be called recursively?
Yes any function including main () can be called recursively.
124. IMP>Can we initialize unions?
ANSI Standard C allows an initializer for the first member of a union. There is no standard way
of initializing any other member
125. whats the difference between these two declarations?
(nor, under a pre-ANSI compiler, is there generally any way of
initializing a union at all).
126. Why doesnt this code: a[i] = i++; work?
The subexpression i++ causes a side effect.it modifies is value.which leads to undefined
behavior since i is also referenced elsewhere in the same expression.
127. WHy doesnt struct x { … };
x thestruct;
work?
C is not C++. Typedef names are not automatically generated for structure tags.
128. Why cant we compare structures?
There is no single, good way for a compiler to implement structure comparison which is consistent with Cs low-level flavor. A simple byte-by-byte comparison could founder on random bits present in unused “holes” in the structure (such padding is used to keep the alignment of later fields correct). A field-by-field comparison might require unacceptable amounts of repetitive code for large structures.
129. Can we use any name in place of argv and argc as command line arguments ?
yes we can use any user defined name in place of argc and argv;
130. What is the difference between an Interface and an Abstract class?
An abstract class can have instance methods that implement a default behavior. An Interface can only declare constants and instance methods, but cannot implement default behavior and all methods are implicitly abstract. An interface has all public members and no implementation. An abstract class is a class which may have the usual flavors of class members (private, protected, etc.), but has some abstract methods.