syntax error, unexpected keyword_end end [closed] - ruby

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I'm getting into Ruby and I've searched and searched and looked at syntax, yet I can't figure out what's going wrong.
The program is supposed to solve a ProjectEuler problem.
I'm encountering four of this syntax error:
unexpected keyword_end end
This is my code:
grid = #20x20 "grid"/array of numbers
largest = 0
lateral(0,1,2,3)
vertical(0,20,40,60)
diagonal_right(0,21,42,63)
diagonal_left(3,22,41,60)
puts largest
#lateral
def lateral(a, b, c, d)
while (d < grid.size)
temp = grid[a] * grid[b] * grid[c] * grid[d]
if (temp > largest)
largest = temp
end
if ((d % 19) == 0)
a += 4
b += 4
c += 4
d += 4
else
a++
b++
c++
d++
end # <===== getting syntax error here
end
end
def vertical(a, b, c, d)
while (d < grid.size)
temp = grid[a] * grid[b] * grid[c] * grid[d]
if (temp > largest)
largest = temp
end
a++
b++
c++
d++
end # <===== getting syntax error here
end
def diagonal_right(a, b, c, d)
while (d < grid.size)
temp = grid[a] * grid[b] * grid[c] * grid[d]
if (temp > largest)
largest = temp
end
if ((d % 19) == 0)
a += 4
b += 4
c += 4
d += 4
else
a++
b++
c++
d++
end # <===== getting syntax error here
end
end
def diagonal_left(a, b, c, d)
while (d < (grid.size - 4))
temp = grid[a] * grid[b] * grid[c] * grid[d]
if (temp > largest)
largest = temp
end
if ((a % 19) == 0)
a += 4
b += 4
c += 4
d += 4
else
a++
b++
c++
d++
end # <===== getting syntax error here
end
end
I marked the four spots where I'm getting the syntax errors.
I've adjusted parentheses, played with and double-checked the ends positions and amount. I do not understand what's wrong with it. Could it be an interpreter problem? I'm using a MacBook Pro.

Answer 1

The ++ operator doesn't exist in Ruby. You should go for += 1.

Answer 2

You have very strange formatting. If you had formatted your code properly by following one of the many Ruby styleguides (or simply hitting Alt+Shift+F or whatever the combination is in your editor of choice), you would have immediately seen the problem. According to most style guides, there should be a space to both sides of a binary infix operator and no space after a unary prefix operator. I.e. you should write foo - bar and !baz. You have no space around your infix operators and a newline in between the unary prefix operator and its operand.
This is what it looks like correctly formatted:
a + +b + +c + +d + + # plus what?
Do you see the problem? You are missing the operand to the last unary prefix + operator.