14 October 2025 07:45:52 PM double_ode_test(): C++ version Test double_ode(), which solves a stiff ODE using euler(). Parameter values: m = 3 n = 5 t0 = 0 y0 = 1, 1, 3 tstop = 10 doughnut_euler(): Solve doughnut ODE using the Euler method. Created data file 'doughnut_ode_data.txt'. Created command file 'doughnut_ode_commands.txt' doughnut_ode_test(): Normal end of execution. 14 October 2025 07:45:52 PM