Rotate image problem

#1

If question says rotate clockwise then we have to reverse columnwise. I want to ask how to implement reverse columnwise ??

#2

you have to do it without stl
using simple function like this

void ReverseCol(int arr[][100],int n){
    for(int col=0;col<n;col++){
        int start=0;
        int end=n-1;
        while(start<end){
            swap(arr[start][col],arr[end][col]);
            start++;
            end--;
        }
    }
}
#3

and with using STL??

#4

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