Is there any ways to rotate a bmp 90 degrees using c++?

#include<iostream>
#include<fstream>
using namespace std;

int main()
{
    fstream flower("flower.bmp", ios::in | ios::out | ios::binary);
    flower.seekg(18,ios::beg);
    char read_arr[4];
    char read_arr1[4];
    flower.read(read_arr,4);
    flower.read(read_arr1,4);
    flower.seekg(22,ios::beg);
    flower.write(read_arr,4);
    flower.seekg(18,ios::beg);
    flower.write(read_arr1,4);

    flower.seekg(54,ios::beg);
    char temp1[3];
    char temp2[3];

int j=0;
for(int k=0;k<=800;k++)
{
    for(int i=0;i<=686;i++)
    {
        flower.seekg((54+(3*i)+(3*j)),ios::beg);
        flower.read(temp1,3);
        flower.seekg(54+800*3*(685-i),ios::beg);
        flower.write(temp1,3);

    }
    j+=686;
}
    flower.close();
}