无效赋值运算符错误 >= Java

Question

I have an if statement that is throwing "invalid assignment operator" in Java (on both lines). I can't figure out what I'm doing wrong here. Any help is appreciated:

if ((row >= 0) && (row < this.rows) && ((col – 1) >= 0) && ((col – 1) < this.cols)) {
         nbrNeighbors += grid[row][col – 1]; 
}

Answer 1

It looks like you are using a wrong character for the minus operation: – ('EN DASH' (U+2013)). Try to use - instead.

Answer 2

I've checked your example in my IDE and the only thing that seems wrong for me is your minus(-) character: Illegal character (U+2013) .

Try to paste my version:

if ((row >= 0) && (row < this.rows) && ((col - 1) >= 0) && ((col - 1) < this.cols)) { nbrNeighbors += grid[row][col - 1]; }