Java: for loop, incompatible types
the second statement: grid[0].length is an integer. The second statement in a for loop is a condition statement and needs to be a boolean.
If you're trying to loop while col is less than the length of grid[0], then you need this as your second statement:
col < grid[0].length;
for (int col= 0; col < grid[0].length; col++) // See the typo
grid[0].length is the integer that the message refered to. A boolean value was expected there:
col < grid[0].length
You need to change your code to something like:for (int col= 0; col<grid[0].length; col++)