逆境给人宝贵的磨炼机会。只有经得起环境考验的人，才能算是真正的强者。自古以来的伟人，大多是抱着不屈不挠的精神，从逆境中挣扎奋斗过来的。 （3）跳转到另一条分支的编程方法
在某种情况下，要求程序从一条分支的某个状态跳转到另一条分支的某个状态继续执行。此时，可以采用跳转到另一条分支的编程方法，如图3所示。



（4）复位处理的编程方法
在用sfc语言编制用户程序时，如果要使某个运行的状态（该状态为1）停止运行（使该状态置0），其编程的方法如图4所示。
图4中，当状态s22为1时，此时若输入x21为l，则将状态s22置0，状态s23置1；若输入x22为1，则将状态s22置0，即该支路停止运行。如果要使该支路重新进入运行，则必须使输入x10为1。
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