CODE EXAMPLE FOR CPP

how to rotate a matrix 90 degrees clockwise

int n=A.size();
    for(int i=0;i<n/2;i++){
        for(int j=i;j<n-i-1;j++){
            int temp=A[i][j];
            A[i][j]=A[n-1-j][i];
            A[n-1-j][i]=A[n-1-i][n-1-j];
            A[n-1-i][n-1-j]=A[j][n-1-i];
            A[j][n-1-i]=temp;
        }
    }