Complete main() to read dates from input, one date per line. Each date's format must be as follows: 03/20/1990. Any date not following that format is incorrect and should be ignored. (Assume that days and months are always given with two digits, for example 03 instead of 3.) Use the substring() method to parse the string and extract the date. The input ends with END on a line alone. Output each correct date as: March 20, 1990. Ex: If the input is:
03/20/1990
April 2 1995
07/05/2020
December 13,
END 00
Then the output is:
March 20, 1990
July 5, 2020

Write a program that displays the following menu: geometry calculator 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 = ď€(the square of r) use 3.14159 for ď€ 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 * .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 circle’s radius, the rectangle’s length or width, or the triangle’s base or height. note: if the user enters an improper menu choice (1-4), the program prints "the valid choices are 1 through 4. run the program again and select one of those." if the user enters a negative radius, the program prints "the radius can not be less than zero." if the user enters a negative value for height or base, the program prints "only enter positive values for base and height."

Explain the importance of html in web page designing in 20 sentences..

Can someone work out the answer as it comes up in one of my computer science exams and i don't understand the cryptovariables