23 June 2025 12:05:45 PM stiff_exact_test(): C++ version Test stiff_exact(), which evaluates exact solutions of a stiff ODE. Initial parameters: lambda = 50 t0 = 0 y0 = 0 tstop = 1 plot4: data stored in 'stiff_value_data1.txt', 'stiff_value_data2.txt', 'stiff_value_data3.txt', 'stiff_value_data4.txt' plot4: plot commands stored in 'stiff_value_commands.txt'. stiff_euler_test(): Solve stiff ODE using the Euler method. Parameters: lambda = 50 t0 = 0 y0 = 0 tstop = 1 plot2: data stored in 'stiff_euler_data1.txt' and 'stiff_euler_data2.txt' plot2: plot commands stored in 'stiff_euler_commands.txt'. stiff_exact_test(): Normal end of execution. 23 June 2025 12:05:45 PM