例如如果START的值21,END的值是1,增加值是-5,执行5次程序循环,下标变量每次减少5,下标变量的值依次是21,16,11,6和1.当START和END的值设置相等,程序循环仅执行一次。当START的值不能增加/减少到END的值时,不执行循环语句。例如,START的值10,END的值是5,INCREMENT的值是1,能流直接从FOR语句跳转到END_ FOR语句后面的语句。
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