C Interview Questions and Answers

What is auto keyword in C?

The auto keyword indicate that the memory location of a variable is temporary. Whereas by default every local variable of the function and block is automatic (auto). 

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What is C language?

C is a high-level programming language and first developed in 1972 by Dennis Ritchie and Ken Thompson at AT& T Bell Labs.

Why C is sometimes called a mid-level programming language?

C supports both low-level (machine) and high level programing that is why it is also known as a mid-level programming language.

What are the advantages and disadvantages of C language?

Advantage and disadvantage of C are
Advantages
It is a high-level programming languages that is closer to human languages, especially English.
C programs can be reused, by saving into a library file and invoking simply by including the library file.
C allows to access computer hardware and peripherals. 
It used compiler, so once program become executable code then we can run it without interacting the compiler.

Disadvantages 
It used complier so complied code not portable on different machine.
C is a procedural language, become difficult to maintain for large application.
Less support to GUI.

What is a variable?

A variable is a name representation of memory storage location and that value can change between program execution.

What is the difference between variable declaration and variable definition?

Declaration associates type to the variable whereas definition is value assignment of the variable.

What is a constant?

When variables are declared with the const keywordcalled constant. The value ofconstant never changed.

What is the difference between local variable and global variable in C?

Local variable: A variable which is declared inside function or block is known as local variable.
Global variable: A variable which is declared outside function or block is known as global variable.

What is Storage Class in C and types of it?

The storage class represent scope and storage type in memory of variable in C.
There are four types of storage cases: Auto,Extern,Static and Register

What is the use of static variable in C?

A variable declared with static keyword, is known as static variable. The static variable retains its value between multiple function calls and has permanent scope.

What are register variables? What are the advantages of using register variables? 

A variable is declared with a register storage class, known as register variable. The register variable is stored in the CPU register instead of main memory. 

Storing of frequently used variable in register might be speed up the code as variable access is faster from register in compare from memory. 

What is the purpose of type declarations? Or use of typedef?

The type declaration allow to create a name synonym for the existing data types that can help to simplify the complex declaration.

Syntax
typedef type identifier; 

How do you know the size of a data type or variable?

The sizeof operator can measure the data type size.

What is type casting?

Converting one data type into another is known as type casting.

What is a function and advantages of it? 

A function is a block of set of instruction that perform specific task.
Advantages
Reusability: function can be reuse in different place to perform same task
Code reduction: repeated code can move into function and can call function in place 
Modularity: task can be simplify by dividing that in modularity, that also increase readability

When is the void keyword used in a function?

When declare functions with void then it will not require return a value.

What is Recursive Functions?

The function can be called by another function and can call itself from a statement inside the body of the function itself. When function called itself then is said to be recursive.

Latest Updates

Fractions

First we increased the denominator of a positive fraction by 3 and then decrease it by 5.The sum of the resulting fractions proves to be equal to 2/3. Find the denominator of the fraction if its numerator is 2?

Simplification

If we divide a two digit number by the sum of its digits we get 4 as a quotient and 3 as a remainder. Now if we divide that two digit number by the product of its digits we get 3 as a quotient and 5 as a remainder . Find the two digit number?

Fractions

The denominators of an irreducible fraction is greater than the numerator by 2.If we reduce the numerator of the reciprocal fraction by 3 and subtract the given fraction from the resulting one,we get 1/15.Find the given fraction?

Simplification

If we add the square of the digit in the tens place of the positive two digit number to the product of the digits of that number we get 52,and if we add the square of the digit in the unit's place to the same product of the digits we get 117.Find the two digit number?

The sum of squares of the digits constituting a positive two digit number is 13, If we subtract 9 from that number we shall get a number written by the same digits in the reverse order. Find the number?

The arithmetic mean of two numbers is smaller by 24 than the larger of the two numbers and the GM of the same numbers exceeds by 12 the smaller of the numbers. Find the numbers?

A number being successively divided by 3,5,8 leaves remainder 1,4,7 respectively. Find the respective remainders if the order of divisors are reversed?

The sum of all possible two digit numbers formed from three different one digit natural numbers when divided by the sum of the original three numbers is equal to?

HCF and LCM

Find the HCF and LCM of the polynomial x2-5x+6 and x2-7x+10?

Simplification

When we multiply a certain two digit number by the sum of its digits , 405 is achieved. If we multiply the number written in reverse order of the same digits by the sum of the digits, we get 486. Find the number?

Average

The sum of two numbers is 15 and their geometric mean is 20% lower than their arithmetic mean. Find the numbers?

Numbers

The difference of 1025-7 and 1024+x is divisible by 3. find x=?

A number when divided by the sum of 555 and 445 gives two times their difference as quotient and 30 as remainder . The number is?

The sum of three prime numbers is 100.If one of them exceeds another by 36 then one of the numbers is?

Find the number of zeros in the factorial of the number 18?

If a number is multiplied by 22 and the same number is added to it then we get a number that is half the square of that number. Find the number?

In doing a division of a question with zero remainder,a candidate took 12 as divisor instead of 21.The quotient obtained by him was 35. The correct quotient is?

Fractions

A number when divided by 342 gives a remainder 47.When the same number is divided by 19 what would be the remainder?

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