Question

replace int** arr

void exchange(int** arr, int rows, int columns){
   int temp;
   for(int i = 0;i<rows;i++){
      for(int j = 0;j<i;j++){
         temp = arr[i][j];
         arr[i][j] = arr[j][i];
         arr[j][i] = temp;
      }
   }
}

rewrite the function without the use if int** arr (use simpler code)

Answer 1

The pointers can be changed to array type, but with the dimensions specified in the declarations.. But the dimensions should be constant or should come from global variables..

So we can do something like below:


int rows = 4;
int columns = 5;

void exchange(int arr[rows][columns]){
   int temp;
   for(int i = 0;i<rows;i++){
      for(int j = 0;j<i;j++){
         temp = arr[i][j];
         arr[i][j] = arr[j][i];
         arr[j][i] = temp;
      }
   }
}