write a C program:There is a mobile keypad with numbers 0-9
and alphabets on it. Take input 0f 7 keys and then form a
word from the alphabets present on the keys.
What is null pointer constant?
Explain enumerated types.
Explain the difference between ++u and u++?
What is the difference between functions getch() and getche()?
write a program to concatenation the string using switch case?
What is difference between structure and union in c programming?
where do we use structure pointer?
can you change name of main()?how?
Explain #pragma in C.
Can a variable be both constant and volatile?
write program on arrays
what is y value of the code if input x=10 y=5; if (x==10) else if(x==9) elae y=8; a.9 b.8 c.6 d.7