Write a C++ (use cout and cin)program that displays the following menu:
2) Write a C++ (use cout and cin)
1. Calculate the area of a circle
2. Calculate the area of a rectangle
3. Calculate the area of a triangle
4. 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 = PI * r * r. Use 3.14159 for Pi 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 rectangle’s area. Use the following formula:
area = length * width
If the user enters 3, the program should ask for the length of the triangle’s 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 1-4 when selecting an item from the menu. Do not accept negative values for the circle’s
radius, the rectangle’s length or width, or the triangle’s base or height.
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