How can I make an if statement that is true only if it works for all i's in a loop?

Question

I have a 2D array of consecutive integers. My code should test if the integers in a row are all in order. I want to write an if statement that evaluates to true only if it is true for all the i's and j's in the loop.

for(int i=0; i<4;i++) {
    for(int j=0; j<13;j++) {
        if(board[i][j]+1 == board[i][j+1]) {
            return true;
        }
    }
}

Again, the if statement should only evaluate to true if the conditions are true for the entire loop.

Answer 1

You can instead check inequality and return false. If you make it all the way through your loop without returning false, return true.

Answer 2

for(int i=0; i<4;i++) {
    for(int j=0; j<13;j++) {
        if(board[i][j]+1 != board[i][j+1]) {
            return false;
        }
    }
}
return true;

Answer 3

Why don't you use a boolean variable. If in any of the iterations of i and j the condition is not met, you invert the value of you variable, and once the for loop is finished you check your variable?

Answer 4

for(int i=0; i<4;i++) {
    for(int j=0; j<13;j++) {
        if(board[i][j]+1 != board[i][j+1]) {  // if any item is not the same
            return false;
        }
    }
}
return true;  // if we get here, all items were the same