public static void main$($String$[]$ args$)\{$

System.out.println$("$Thank you for using the area calculator"$)$;

System.out.println$("$This calculator lets you get the area of: $")$;

System.out.println$("1-$ Square

$2-$ Rectangle

$3-$ Triangle

$4-$ Circle

$")$;

$//$Task $5$ Call area functions.

$//$ double square $=$ area of square with a side of $2.$

$//$ double rectangle $=$ area of rectangle with a length of $1,$ and a width of $2.$

$//$ double triangle $=$ area of triangle with a base of $1,$ and a width of $2.$

$//$ double circle $=$ area of circle with a radius of $2.$

$//$Task $7$ Call a function that prints all the areas.

$\}$

$//$Task $1-$ Write a function that calculates the area of a square.

$/**$

$*$ Function name: areaSquare $-$ returns the area of a square.

$*$ @param side $($double$)$

$*$ @return the area $($double$)$

$*$

$*$ Inside the function:

$*1.$ If the side is negative, prints "Error: impossible" and terminates the java program.

$*2.$ Calculates the area of the square. A $=$ side$^2$

$*/$

public static double areaSquare$($double side$)\{$

return $0$;

$\}$

$//$Task $2-$ Write a function that calculates the area of a rectangle.

$/**$

$*$ Function name: areaRectangle $$ returns the area of a rectangle.

$*$ @param length $($double$).$

$*$ @param width $($double$).$

$*$ @return the area $($double$)$

$*$

$*$ Inside the function:

$*1.$ If the length OR width is negative, prints "Error: impossible" and terminates the program.

$*2.$ Calculates the area of the rectangle. A $=$ length $*$ width

$*/$

public static double areaRectangle$($double length, double width$)\{$

return $0$;

$\}$

$//$Task $3-$ Write a function that calculates the area of a triangle.

$/**$

$*$ Function name: areaTriangle $$ it returns the area of a triangle.

$*$ @param base: $($double$).$

$*$ @param height: $($double$).$

$*$ @return the area $($double$)$

$*$

$*$ Inside the function:

$*1.$ If the base OR height is negative, prints "Error: impossible" and terminates the program.

$*2.$ Calculates the area of the triangle. A $=($base $*$ height$)/2$

$*/$

public static double areaTriangle$($double base, double height$)\{$

return $0$;

$\}$

$//$Task $4-$ Write a function that calculates the area of circle.

$/**$

$*$ Function name: areaCircle $$ it returns the area of a circle.

$*$ @param radius $($double$).$

$*$ @return area $($double$)$

$*$

$*$ Inside the function:

$*1.$ If the radius is negative, prints "Error: impossible" and terminates the program.

$*2.$ Calculates the area of the circle.

$*/$

public static double areaCircle$($double radius$)\{$

return $0$;

$\}$

$//$Task $6$: Write a function that prints every area.

$/**$

$*$ Function name: printAreas $$ it prints four areas

$*$ @param square $$ square area $($double$)$

$*$ @param rectangle $$ rectangle area $($double$)$

$*$ @param triangle $$ triangle area $($double$)$

$*$ @param circle $$ circle area $($double$)$

$*$

$*$ Inside the function:

$*1.$ print: $("$Square area: $")$

$*2.$ print: $("$Rectangle area: $")$

$*3.$ print: $("$Triangle area: $")$

$*4.$ print: $("$Circle area: $")$

$*$

$*/$

$\}$