How this is working

#1

static void reverseColumns(int arr[][])
{
for (int i = 0; i < arr[0].length; i++)
for (int j = 0, k = arr[0].length - 1;
j < k; j++, k–) {
int temp = arr[j][i];
arr[j][i] = arr[k][i];
arr[k][i] = temp;
}
}

#2

hi @pallavigoel1996
it similar to reversing an array
for any row i
j is at 0 index and k is at array length-1
just swap elements
and increase j and decease k simultaneously
this process will continue till middle index after that it will terminate

#3

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