C Programming Interview Questions

1) What is the use of printf() and scanf() functions?

printf(): The printf() function is used to print the integer, character, float and string values on to the screen.

Following are the format specifier:

• %d: It is a format specifier used to print an integer value.
• %s: It is a format specifier used to print a string.
• %c: It is a format specifier used to display a character value.
• %f: It is a format specifier used to display a floating point value.

scanf(): The scanf() function is used to take input from the user.

2) What is the use of a static variable in C?

Following are the uses of a static variable:

• A variable which is declared as static is known as a static variable. The static variable retains its value between multiple function calls.
• Static variables are used because the scope of the static variable is available in the entire program. So, we can access a static variable anywhere in the program.
• The static variable is initially initialized to zero. If we update the value of a variable, then the updated value is assigned.
• The static variable is used as a common value which is shared by all the methods.
• The static variable is initialized only once in the memory heap to reduce the memory usage

  3) What is the use of the function in C?

  Uses of C function are:
  
  • C functions are used to avoid the rewriting the same code again and again in our program.
  • C functions can be called any number of times from any place of our program.
  • When a program is divided into functions, then any part of our program can easily be tracked.
  • C functions provide the reusability concept, i.e., it breaks the big task into smaller tasks so that it makes the C program more understandable.

C Programming Interview Questions

1) What is C language?

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 2) Why is C called a mid-level programming language? C is called a mid-level programming language because it binds the low level and high -level programming language. We can use C language as a System programming to develop the operating system as well as an Application programming to generate menu driven customer driven billing system 3) What are the features of the C language? The main features of C language are given below: Simple: C is a simple language because it follows the structured approach, i.e., a program is broken into parts Portable: C is highly portable means that once the program is written can be run on any machine with little or no modifications. Mid Level: C is a mid-level programming language as it combines the low- level language with the features of the high-level language. Structured: C is a structured language as the C program is broken into parts. Fast Speed: C language is very fast as it uses a powerful set of data types and operators. Memory Management: C provides an inbuilt memory function that saves the memory and improves the efficiency of our program. Extensible: C is an extensible language as it can adopt new features in the future.