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May 27th, 2016, 03:24 PM  #1 
Newbie Joined: May 2016 From: Nevada Posts: 1 Thanks: 1  Math Equation with no conditional logic needed for programming
I am using the Ninja Forms plugin for a WordPress website which only allows for basic math calculations using simple operations (+  * or /). You can see the current test form here: Stall Reservation Form Test  One Day One Million PROBLEM Basically the user can reserve any of the 5 dates listed. If they reserve 14 dates the cost is \$155.00 but if they reserve a 5th date the cost is \$190.00 (adding \$35). FIRST SOLUTION (NOT WORKING) Right now, I gave each DATE a value of 1. I then told it to add up the total # of dates (resulting in any number from 1  5). I created a Date Calculation field (DC) with the equation: DATE/4 = x and I wanted to use this to say: If x > 1 then COST + \$35.00 = TOTAL COST. The problem with this solution is that there is no conditional logic in the form software to adjust the numbers live with user interaction. I have to think of another equation that can add \$35.00 to the total COST if they select 5 dates. POSSIBLE SOLUTION The only thing I can think of is an equation (using basic math operators) that that can make x = 1 if 5 dates are selected and x = 0 if 14 dates are selected. Then I can just say COST + 35x = TOTAL COST. Resulting equations would be: 1  4 dates: 155 + (35 * 0) = 155 5 dates: 155 + (35 * 1) = 190 I have no idea how to do this using basic operators and no conditional logic while programming. We can give each date any number value, but we must realize that the user may not want any single night in the list. This means that they may reserve all the dates or just Sun  Wed or maybe Sat  Tues or even just not Monday. In this case, all values for the dates should be the same. Thanks in advance to any math geniuses that can figure this one out! Last edited by skipjack; May 27th, 2016 at 04:22 PM. 
May 28th, 2016, 10:31 AM  #2 
Senior Member Joined: May 2016 From: USA Posts: 1,310 Thanks: 551 
Assign a variable for each date, say a for the first date, b for the second date. If date 1 is chosen, a = 1; if a is not chosen, a = 0. I am presuming that you can code differently dates chosen and not chosen. $Total\ cost = 155 + (a * b * c * d * e * 35).$ 
May 28th, 2016, 07:11 PM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,419 Thanks: 1025  
May 28th, 2016, 08:42 PM  #4 
Senior Member Joined: May 2016 From: USA Posts: 1,310 Thanks: 551  
May 28th, 2016, 09:00 PM  #5 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,419 Thanks: 1025 
Merci Jeffroi. Would help if I read slowly and fully... 

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conditional, equation, logic, math, needed, programming 
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