title: Summing multiple float values into a new float (Double values)
body: <p>How can I sum multiple doubleValues into a new double? At the moment I have tried like this: </p>
  
  <pre><code>double sum = doubleWantToSum1 + doubleWantToSum2 + doubleWantToSum; //etc...
  </code></pre>
  
  <p>And further, I want to use the result for this equation in</p>
  
  <pre><code>double tooMuch = sum - 100;
  </code></pre>
  
  <p>Which I want to return 100 minus the total value of my floats. At the moment the only thing this does is  to output doubleWantToSum1 - 100. I believe the answer to this rediciously simple, but since I could not find anything on the internet about this I would love it if one of you guys told me.  </p>
  
  <p><strong>EDIT, ADDED CODE</strong>
  Note, I know this is poor and probably uneffective.</p>
  
  <pre><code>//Nummerformatterere - Kinda unødvendig
  NSNumberFormatter *fmt1  =  [NSNumberFormatter new]; //Temp
  NSNumberFormatter *fmt2  =  [NSNumberFormatter new]; //Methane
  NSNumberFormatter *fmt3  =  [NSNumberFormatter new]; //Ethane
  NSNumberFormatter *fmt4  =  [NSNumberFormatter new]; //Propane
  NSNumberFormatter *fmt5  =  [NSNumberFormatter new]; //n-butane
  NSNumberFormatter *fmt6  =  [NSNumberFormatter new]; //i-butane
  NSNumberFormatter *fmt7  =  [NSNumberFormatter new]; //n-petane
  NSNumberFormatter *fmt8  =  [NSNumberFormatter new]; //i-petane
  NSNumberFormatter *fmt9  =  [NSNumberFormatter new]; //n-hexane
  NSNumberFormatter *fmt10 =  [NSNumberFormatter new]; //nitrogen
  NSNumberFormatter *fmt11 =  [NSNumberFormatter new]; //oxygen
  
  //Float for å få textfieldsene til nummer
  double temprature = [fmt1  numberFromString: tempratureText.text].doubleValue;
  double methane    = [fmt2  numberFromString: methaneText.text   ].doubleValue;
  double ethane     = [fmt3  numberFromString: ethaneText.text    ].doubleValue;
  double propane    = [fmt4  numberFromString: propaneText.text   ].doubleValue;
  double nbutane    = [fmt5  numberFromString: nbutaneText.text   ].doubleValue;
  double ibutane    = [fmt6  numberFromString: ibutaneText.text   ].doubleValue;
  double npetane    = [fmt7  numberFromString: npetaneText.text   ].doubleValue;
  double ipetane    = [fmt8  numberFromString: ipetaneText.text   ].doubleValue;
  double nhexane    = [fmt9  numberFromString: nhexaneText.text   ].doubleValue;
  double nitrogen   = [fmt10 numberFromString: nitrogenText.text  ].doubleValue;
  double oxygen     = [fmt11 numberFromString: oxygenText.text    ].doubleValue;
  
  //Floats og formatters for underflow, overflow
  double sum = (methane + ethane + propane + nbutane + ibutane + npetane + ipetane + nhexane + nitrogen + oxygen);
  double overflowPart = 100 - sum;
  double underflowPart = sum - 100;
  
  NSNumber *underFlow = [[NSNumber alloc]initWithDouble:underflowPart];
  NSNumberFormatter *underFlowResult = [[NSNumberFormatter alloc] init];
  underFlowResult.numberStyle = NSNumberFormatterDecimalStyle;
  [underFlowResult setNumberStyle:NSNumberFormatterDecimalStyle];
  [underFlowResult setMaximumFractionDigits:2];
  NSString *formattedUnderFlow = [underFlowResult stringFromNumber:(NSNumber*)underFlow];
  
  NSNumber *overFlow = [[NSNumber alloc]initWithDouble:underflowPart];
  NSNumberFormatter *overFlowResult = [[NSNumberFormatter alloc] init];
  overFlowResult.numberStyle = NSNumberFormatterDecimalStyle;
  [overFlowResult setNumberStyle:NSNumberFormatterDecimalStyle];
  [overFlowResult setMaximumFractionDigits:2];
  
  NSString *formattedOverFlow = [overFlowResult stringFromNumber:(NSNumber*)overFlow];
  
  //Floats for variabler til ligningen
  double Xi = 1;
  double Mi = 2;
  double Vi = 3;
  double Vc = 4;
  
  //Ligningen for å regne ut density
  double over1 = Xi * Mi;
  double under1 = Xi * Vi - Vc;
  
  //=RESULT=
  double result =  over1 / under1;
  
  /*----------STREK FORDI DET ER CHILL OG JEG ER FERDIG MED FLOATER----------*/
  
  NSString *resultString = [[NSString alloc]initWithFormat:@"D = %f", result];
  NSString *overflowString = [[NSString alloc]initWithFormat:@"Total %@ greater than 100 %", formattedOverFlow ];
  NSString *underflowString = [[NSString alloc]initWithFormat:@"Total %@ less than 100 %", formattedUnderFlow];
  
  /*----------STREK FORDI DET ER CHILL OG JEG ER FERDIG MED STRINGS----------*/
  /*
  if (temprature == 0 || methane == 0 || ethane == 0 || propane == 0 || nbutane == 0 || ibutane == 0 || oxygen == 0 || npetane == 0 || ipetane == 0 || nhexane == 0 || nitrogen == 0)
  {
      outputText.text = @"Please enter all values";
  } */
  if (underflowPart == 100)
  {
      outputText.text = @"Start by entering values above";
  }
  if (sum == 100)
  {
      outputText.text = resultString;
  }
  
  if (sum &gt; 100)
  {
      outputText.text = overflowString;
  }
  
  if (sum &lt; 100)
  {
      outputText.text = underflowString;
  }
  /*----------STREK FORDI DET ER CHILL OG JEG ER FERDIG MED 'if'----------*/
  </code></pre>