cypreess

import math

def calculate_initial_compass_bearing(pointA, pointB):
    """
    Calculates the bearing between two points.

    The formulae used is the following:
        θ = atan2(sin(Δlong).cos(lat2),
                  cos(lat1).sin(lat2) − sin(lat1).cos(lat2).cos(Δlong))

cypreess

cypreess@iMac ~ cat f.cc
#include <stdio.h>

int main(){
    unsigned char a = 255;
    unsigned long int b = (a << 24);
    unsigned long int c = ((unsigned long int) a << 24);

    printf("b=%lu\n", b);
    printf("c=%lu\n", c);