How do I assign an array element in a 2D array to a variable?-CodePudding

int board[4][8] = {
    {0, 1, 2, 3, 4, 5, 6, 7},
    {1, 2, 3, 4, 5, 6, 7, 8},
    {2, 3, 4, 5, 6, 7, 8, 9},
    {3, 4, 5, 6, 7, 8, 9, 10},
};

int secondRow[8] = board[1]; // <-- error: invalid initializer

for (int i = 0; i < 8; i  ) {
    if (someCondition(secondRow[i])) {
        // ...
    }
}

How do I assign the second element in board (the {1, 2, ..., 7, 8} array) to secondRow? Do I declare secondRow as a pointer of some sorts instead? If so, can I still use it in the same way in the loop below (or how should I change it)?

CodePudding user response：

You cannot. You must either copy it or reference it.

You probably want the latter:

int * secondRow = board[1];

for (int i = 0; i < 8; i  ) {
    if (someCondition(secondRow[i]))
        ...
}

Arrays are not first class citizens in C and C .

CodePudding user response：

Maybe not the answer you are looking for but if you are already looping through secondRow[i] why not assign values as you go?

for (int i = 0; i < 8; i  ) {
    secondRow[i]=board[1][i]; //Here
    if (someCondition(secondRow[i])) {
        // ...
    }
}