C++

I need help with this code as quickly as possibly. Thank you.

Program Specifications Sample Run (User input is in bold) - If the user selects choice 2, the program shall ask 1 - square the user for the radius of the circle (can be a 2-circle decimal number) and shall calculate the area of the 3 quit circle and output it as shown in the sample run to 7 the right. Use 3.14 for the value of pi. Invalid input. Try again. - If the user selects choice 3 , the program shall quit after outputting an additional newline. 1 - square - If the user enters a value for choice that is not in 23-circle-quit the range [1,3] then the program shall output an 3 error message as shown in the sample run to the right and will then re-display the menu. (The program terminates)