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
91. Difference between linker and linkage?
Linker converts an object code into an executable code by linking together the necessary built in
functions. The form and place of declaration where the variable is declared in a program determine the linkage of variable.
92. Is it possible to have negative index in an array?
Yes it is possible to index with negative value provided there are data stored in this location. Even if it is illegal to refer to the elements that are out of array bounds, the compiler will not produce error because C has no check on the bounds of an array.
93. Why is it necessary to give the size of an array in an array declaration?
When an array is declared, the compiler allocates a base address and reserves enough space in
memory for all the elements of the array. The size is required to allocate the required space and hence size must be mentioned.
94. What modular programming?
If a program is large, it is subdivided into a number of smaller programs that are called modules or subprograms. If a complex problem is solved using more modules, this approach is known as modular programming.
95. What is a function?
A large program is subdivided into a number of smaller programs or subprograms. Each subprogram
96. What is an argument?
An argument is an entity used to pass data from the calling to a called function.
97. What are built in functions?
The functions that are predefined and supplied along with the compiler are known as built-in functions. They are also known as library functions.
98. Difference between formal argument and actual argument?
Formal arguments are the arguments available in the function definition. They are preceded by
their own data type. Actual arguments are available in the function call. These arguments are given
as constants or variables or expressions to pass the values to the function.
99. Is it possible to have more than one main() function in a C program ?
The function main() can appear only once. The program execution starts from main.
100. What is the difference between an enumeration and a set of pre-processor # defines?
There is hardly any difference between the two, except that #defines has a global effect (throughout the file) whereas an enumeration can have an effect local to the block if desired. Some advantages of enumeration are that the numeric values are automatically assigned whereas in #define we have to explicitly define them. A disadvantage is that we have no control over the size of enumeration variables.