C Interview Questions and Answers

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 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). 

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; 

Latest Updates

General Knowledge of India

In 1897, the Birsa Movement supporters raised which colour flag as a symbol of Birsa Raj?

Ratio and Proportion

The cost of 10 books is Rs. 80/-. Find the value of 15 books?

The cost of 48 bags of paddy is Rs. 16,800/-. What is the cost of 36 bags of paddy?

Monthly expenditure of a family of 4 members is Rs 2800/-. What is the expenditure if there are 3 members in the family?

Annual incomes of the families of Sita and Latha are in the ratio 4:3 and their annual expenditure are in the ratio 3:2. What is their annual income if they save Rs. 3000/- in a year?

A certain sum of money is divided between A and B in the ratio of 5/4 : 5/3 and A got Rs. 360/-. Find the total sum of money and B’s share?

In an office, the ratio of the salaries of an officer and a clerk is 15:7. If the salary of a clerk is Rs. 720/- less than the salary of the officer, find the salary of each?

In an election to a municipal council, the votes secured by two candidates are in the ratio 13:19. The elected candidates gets 312 votes more than the second candidate. How many votes are secured by the second candidate?

A certain sum of money is divided between Murthy and Prasad in the ratio 22/7 : 8/3. If Murthy gets Rs. 120/- more than Prasad, find the share of each?

In a cricket test series, the runs made by Raju and Tendulkar are in the ratio 5:9 and Tendulkar and Azar are in the ratio 6:7. What are the runs made by them if Azar makes 187 runs more than Raju?

If A:B = 2:3 and B:C = 9:5 find A:B:C?

If A:B = 3/5:5/7 and B:C = 3/4:2/5, find A:B:C?

If R:S = 0.01:0.11 and S:T = 2.2:1, Find R:S:T?

In a school, Under a Saving Scheme, Rekha saves 3/2 times the savings of Bindu, Geeta saves 4 times the savings of Rekha. Find the ratio of the savings of all the three in least terms?

Simplification

A man left 1/3 rd of his property to his wife and 3/5 th of the remainder to his daughter. He gave the rest to his son who received Rs. 6400/-. How much was his original property worth?

Ratio and Proportion

In a school 4/9 of the pupils are boys. There are 125 girls. How many boys are there?

If A:B = 3:4 and B:C = 5:6, find A:C?

IF X:Y = 3:4 AND Y:Z = 4:5, FIND X:Y:Z?