BIT C Programming

Explain the role of functions in programming. How is a function declared, defined and called in C? Write a program to find the factorial of 'n' using a recursive function.

What is an Identifier and keyword? Explain the rules for naming valid identifiers in C with examples. Write a C program to find the sum of digits of an 'n' digit number.

How is structure different from union? Write a program to store and display basic information (roll, name, address, email, and phone) of students using a structure.

What is the basic structure of a C program? Explain each part.

How is the break statement different from the continue statement? Explain with examples.

What do you mean by a multi-dimensional array? Write program logic to add and display the sum of two m × n matrices.

Find errors (if any) in the following program and rewrite it:

   #define (studio,h)
   float main < >
   int m [ ] [ ] = {{ 1,2,3,4}};
   for (i = 4, I>=0 ; i--)
   for (j=0, j <4; j++);
   m [i] [j] = a[i][j] + b[i][j];
   return 0. 0;
   }

Write a program to generate the following pattern of integers:  

   1
   1 2
   1 2 3
   1 2 3 4
   1 2 3 4 5

Write a C program to check whether a given string is a palindrome or not.

What is a pointer? Illustrate the use of a double pointer with a suitable example.

Why is file handling used in programming? Explain different file opening modes.

Write short notes on: 
a. Macros
b. Null Pointer