这个主要是研究：Basic Numerical Methods for Scalar Conservation Laws

-These codes will produce two ASCII output files:

lf.out, lw.out, roe.out, or bwsplit.out. Lists delta_t, delta_x, and lambda. Also lists the final time requested vs. actual final time (these may differ if delta_t is not an even divisor of tfinal). Finally, lists the initial vs. final conditions at each point.

lf.plt, lw.plt, roe.plt, or bwsplit.plt. Approximate vs. real solution at each point.