C PROGRAMMING

1. What are formatted input / output functions? Explain in detail. Why are they called formatted and unformatted? 
2. What is operator? Explain each operator .
3. Explain the format of following with example:

          printf()

          scanf()

          getchar()

          putchar()

          gets()

          puts()

4. Difference between getch() and getche().
5. Why is semicolon used at the end of a statement? 
6. Write a program to multiply two numbers and display products. The program should ask the user for two numbers from the keyboard.
7. Write a program to convert Cartesian coordinate to polar coordinate.
8. Write a program to find compound interest for a given principal amount, time in years and rate in %.
9. Write a program to read the height and base of a triangle and find the area of it.
10. Write a program to illustrate the usage of all  escape characters set available in C-programming language.(eg. \n,\t,\a etc.)
11. What are the rules for naming an identifier? Name any 5 keywords.
12. Solve the expression: [ans: a=11, b=23, c=241]=]

int a=2,b=3,c;

a=(b++) + (++b) +a;

c=a>b ? a:b;

b=(a++) + (b--) +a;

c=c++ * b--;