Question $1$: Write a Java program that takes an input in feet and converts it to inches. If the input is less than $0,$ print "Invalid input," otherwise, print the equivalent length in inches.

Example:

If feet $=-3$: Print Invalld

If feet $=6\mathrm{.}3$: Print $75$ inches

Question $2$: Take $3$ numbers as input from the user and print the blggest and the smallest numbers.

Example:

Input:

num $1=4$

num $2=3$

num$3=7$

Output:

Biggest number $=7$

Smallest number $=3$

Question $3$: Write a Java program that takes an integer number from the user and prints "Positive" if the number Is greater than $0,$ "Negative" if the number is less than $0,$ and "Zero" If the number is $0.$

Example:

Input: num $=1|$ Output Positive

Input: num $=-4|$ Output: Negative

Input: num $=0|$ Output: Zero

between $60$ and $69($inclusive$),$ print $"D".$ Otherwise, print $"F".$

Example:

Input:

$|$ Output: $A$

Input score $=85|$ Output: $B$

Input score $=76|$ Output: $C$

Input

Input

$|$ Output: $D$

I Output: $F$

of the operation between and b$.$ If the operator is not one of the specified characters, print "Invalid operator".

Example:

Input: $a=5,b=3,$ operator $=1,$ Output: $8\mathrm{.}0$

Input $a=10,b=2,$ operator $=\frac{1}{1}$ Output: $5.$a

Input: $a=8,b=2,$ operator $={?}^{\text{'}}\%\text{'}1$ Output:

discount. Otherwise, no discount is applied. Print the final amount after applying the discount.

Example:

Input: purchaseAmount $=1500|$ Output: Final Amount: $$1350\mathrm{.}0$

Input purchaseAmiount $=750|$ Output: Final Amount: $$712\mathrm{.}5$

Input: purchaseAmount $=400|$ Output Final Amount: $$400\mathrm{.}0$

Question $7$: Develop a Java propram that acts as a simple calculator. The program takes three inputs: two double values a and $b,$ and a char operator. Depending on the value of

of the operation between a and $b.$ If the operator is not one of the specified characters, print "Invalid operator".

$,\text{'}-\text{'},\text{'},\text{'},\text{'}/\text{'}),$ the program should print the result