Loop and convert to doubles

Loop and convert to doubles

Help in a loop to reloop and convert the prices and prices2 of those
houses in the array to a double???????
for (int i=0;getline(file,(house[i]),',');i++)
{
getline(file, cars[i], ',');
getline(file, price[i], ',') ;
getline(file, price2[i]);
if(input == house[i])
{
for(int i=0; ) ?????<<<<<<<<<<<<<<--Help here.
}