Q$3$ Write a C program that:

Asks the user to enter two words.

Prints the letters of the string backwards.

The letters should be printed on the same line, not one per line.

The program produces output as shown below:

Please enter the first word: Blue

Please enter the second word: Dart

First word reversed: eulB traD

Q$4$ Write a C program that does the following:

Defines an integer array arr $[20]=\{1,2,3,4,5,6,7,8\}$;

Lists all pairs of numbers of consecutive numbers as shown in the sample output.

Uses for loops to solve the problem.

$(1,2),(2,3),(3,4)(4,5),(5,6),(6,7)(7,8)$

Q$5$ Write a C program that does the following:

Accepts a $1$ to $10-$digit number or $-1$ from the user in an infinite loop.

The program comes out of the infinite loop and exits if the user types $-1$

Sums the digits of the number.

Defines a function int sum$\_$digits $($int num$)$ that accepts an integer and returns the sum of its digits.

Prints the sum of the digits.

Prints an output as shown below.

Please enter a number $(1$ to $10$ digits$)$ or $-1$ to exit: $12345$

The sum of digits of $12345$ is $15.$

Please enter a number $(1$ to $10$ digits$)$ or $-1$ to exit: $5555$

The sum of digits of $5555$ is $20.$

Please enter a number $(1$ to $10$ digits$)$ or $-1$ to exit: $-1$

Exiting the program.

Q$6$ Write a C program that does the following:

Accepts a $1$ to $10-$character word or "exit" from the user in an infinite loop.

The program comes out of the infinite loop and exits if the user types "exit".

Uses bubble sort to sort the characters in the user input.

Prints the sorted word.

Prints an output as shown below.

Please enter a word $(1$ to $10$ characters$)$ or 'exit' to quit: words

Sorted word: dorsw

Please enter a word $(1$ to $10$ characters$)$ or 'exit' to quit: characters

Sorted word: aaccehrrst

Please enter a word $(1$ to $10$ characters$)$ or 'exit' to quit: yellow

Sorted word: ellowy

Please enter a word $(1$ to $10$ characters$)$ or 'exit' to quit: exit

Exiting the program.