Question

I have the following two for loops in sequence. It’s very strange that the first for loop works when I run it alone. But when I run the second loop alone, I get a index out of range exception error. Can someone help me to check what the error is? Thanks a lot!

for (i = NiPricePointer; i < 551; i++)  
   {
      tempUpper = tempUpper + NiPriceCounter[i];
      if (tempUpper >= (NiPriceRounds * 0.3))
      {
          chart3.Series["Upper 30%"].Points.AddXY(k * 500, ((i - 1) * 0.1 + 5));
          break;
      }
 }

for (i = NiPricePointer; i>0; i--) //This loop always gives me out of range problems.
 {
      tempLower = tempLower + NiPriceCounter[i];
      if (tempLower >= (NiPriceRounds * 0.3))
      {
          chart3.Series["Lower 30%"].Points.AddXY(k * 500, ((i - 1) * 0.1 + 5));
          break;
       }
 }

The initialization of the array:

int[] NiPriceCounter = new int[551];

Thanks a lot!

Answer 1

I suppose, NiPricePointer simply is greater than 550. Both of your loops should contain both bounds as a check:

for (i = NiPricePointer; i < 551 && i >=0; i++)  

and

for (i = NiPricePointer; i < 551 && i >=0 ; i--)