use C++ no while statements and make it simple

Geometry Calculator

Write a program that displays the following menu:

Geometry Calculator

Calculate the Area of a Circle

Calculate the Area of a Rectangle

Calculate the Area of a Triangle

Quit

Enter your choice (1- 4):

If the user enters 1, the program should ask for the radius of the circle and then display its area. Use the following formula:

area = 2

r

2

Use 3.14159 for and the radius of the circle for r. If the user enters 2, the program should ask for the length and width of the rectangle and then display the rectangles area. Use the following formula:

area = length * width

If the user enters 3 the program should ask for the length of the triangles base and its height, and then display its area. Use the following formula:

area = base * height * 0.5

If the user enters 4, the program should end.

Input Validation: Display an error message if the user enters a number outside the range of 1 through 4 when selecting an item from the menu. Do not accept negative values for the circles radius, the rectangles length or width, or the triangles base or height.