Math Formula w/ multiple "if"'s?

[jamiescale]

Newbie here...I'm working on my 1st iphone app and have hit a snag.

Basically, there are 4 text input fields. the first 3 are for numbers (num1, num2, num3), the 4th one (call it form1) someone selects a number between 1 and 3 for 3 different formulas to be applied to those other 3 numbers.

ex: if someone selects "1" for form1, then the formula is:
((num1-num3)*num2))*.8
if someone selects "2" for form1 then its:
((num1-num3)*num2))*.5
if someone selects "3" for form1 then its:
((num1-num3)*num2))*.3

I'm completely stuck on the syntax and like I said, ultra-new to sw dev in general so any help would be GREATLY appreciated.

Thanks in advance!

[baja_yu]

switch (text3.text.intValue) {
   case 1:
      //do stuff
   break;
  
   //etc...
}

more here: The Objective-C switch Statement - Techotopia

[jamiescale]

Originally Posted by baja_yu

switch (text3.text.intValue) {
   case 1:
      //do stuff
   break;
  
   //etc...
}

more here: The Objective-C switch Statement - Techotopia

Not sure I follow you. I'm real new to programming/iphone SDK so is there any way you could put it in plainer English?

[baja_yu]

Check the tutorial in the link that I posted, it explains how the switch statement is used.

[Duncan C]

Originally Posted by jamiescale

Newbie here...I'm working on my 1st iphone app and have hit a snag.

Basically, there are 4 text input fields. the first 3 are for numbers (num1, num2, num3), the 4th one (call it form1) someone selects a number between 1 and 3 for 3 different formulas to be applied to those other 3 numbers.

ex: if someone selects "1" for form1, then the formula is:
((num1-num3)*num2))*.8
if someone selects "2" for form1 then its:
((num1-num3)*num2))*.5
if someone selects "3" for form1 then its:
((num1-num3)*num2))*.3

I'm completely stuck on the syntax and like I said, ultra-new to sw dev in general so any help would be GREATLY appreciated.

Thanks in advance!

If you have an input field called form1, baya's approach would look like this:

float result, multiplier;
switch ([form1.text intValue])
{
  case 1:
    multiplier = .8;
    break;

   case 1:
    multiplier = .5;
    break;

  case 1:
    multiplier = .3;
    break;
}
float value1 = [num1.text floatValue];
float value2 = [num1.text floatValue];
float value3 = [num1.text floatValue];
result = ((value1-value3)*value2))* multiplier;

Bear in mind that this code is probably not perfect. There are probably a couple of syntax errors, and the code probably won't fit into your app without some changes. Don't post back, telling me that there is this or that error when you try to compile it. I've spoon-fed you 90% of it. The last 10% is up to you.

[87vert]

Originally Posted by Duncan C

I've spoon-fed you 90% of it. The last 10% is up to you.

LOL

[jamiescale]

Originally Posted by Duncan C

If you have an input field called form1, baya's approach would look like this:

float result, multiplier;
switch ([form1.text intValue])
{
  case 1:
    multiplier = .8;
    break;

   case 1:
    multiplier = .5;
    break;

  case 1:
    multiplier = .3;
    break;
}
float value1 = [num1.text floatValue];
float value2 = [num1.text floatValue];
float value3 = [num1.text floatValue];
result = ((value1-value3)*value2))* multiplier;

Bear in mind that this code is probably not perfect. There are probably a couple of syntax errors, and the code probably won't fit into your app without some changes. Don't post back, telling me that there is this or that error when you try to compile it. I've spoon-fed you 90% of it. The last 10% is up to you.

This is perfect... I can figure the rest out from here. Thanks again!