grand total

I'm trying to find the grand total from two totals inside a loop. I'm getting some crazy numbers. Any help would be great. Thanks.

Code:

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        installCost = yards * 5;
        carpCost = yards * carpPrice;
        totalCost = installCost + padCost + carpCost;
       
        //Calculate Grand Totals
        //yards = totalYards;
      //  totalInstall = installCost;
    //    totalPad = padCost;
  //      totalCarp = carpCost;
//        grandTotal = totalCost;
       
        totalYards += yards;
        totalInstall += installCost;
        totalPad += padCost;
        totalCarp += carpCost;
        grandTotal += totalCost;
       
        //Display output
        cout << "Room " << roomCount << " installation = $" << installCost << endl;
        cout << "Room " << roomCount << " Padding Cost = $" << padCost << endl;
        cout << "Room " << roomCount << " Carpet Cost = $" << carpCost << endl;
        cout << "Room " << roomCount << " Total Cost = $" << totalCost << endl;
             
        } 

    //Display Grand Totals
    cout << "For " << rooms << " rooms: " << endl;
    cout << "Total square yards required: " << totalYards << endl;
    cout << "Total installation: $" << totalInstall << endl;
    cout << "Total padding: $" << totalPad << endl;
    cout << "Total carpeting: $" << totalCarp << endl;
    cout << "Grand Total: $" << grandTotal << endl;

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Heres the beginning of the loop:

Code:

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  for (roomCount = 1; roomCount <= rooms; roomCount++)
    {
        cout << "Enter length for Room " << roomCount << " : ";
        cin >> length;
        cout << "Enter width for Room " << roomCount << " : ";
        cin >> width;
        cout << endl;
        cout << "1.Good - $3 per yard - [1-3 yr warrantee]" << endl;
        cout << "2.Better - $4 per yard - [3-5 yr warrantee]" << endl;
        cout << "3.Best - $5 per yard - [5-10 yr warrantee]" << endl;
        cout << "4.Excellent - $7 per yard - [10-20 yr warrantee]" << endl;
       
        //Select padding
        cout << "Enter number of padding choice <1-4>: ";
        cin >> padChoice;
       
        area = length * width;
        yards = area / 3;
               
        switch (padChoice)
        {
              case 1 : padCost = goodPad * yards;
                          break;
              case 2 : padCost = betterPad * yards;
                          break;
              case 3 : padCost = bestPad * yards;
                          break;
              case 4 : padCost = excelPad * yards;
                          break;
              default  : cout << "You must select 1 - 4" << endl;         
        }
       
        cout << "Enter number of carpeting per sq yd of room "<< roomCount << ": ";
        cin >> carpPrice;
        cout << "Room " << roomCount << " yards required = " << yards << endl;

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