编译原理的课程设计：PL/0 扩充 1.扩充赋值运算：+= 、-=、++ 和 –

　　2.扩充语句 　　REPEAT

　　 <语句序列>

　　 　　UNTIL <条件>

其中，<条件>是循环条件，即条件不成立时，重复执行循环体的< 语句序列>；条件成立时，循环结束。

3.增加一维数组类型（增加了6条指令）-Compiler theory course design: PL/expansion 1. Expansion assignment operator:+ =,- =,++ and- 2. Expansion statement that the REPEAT < statement sequence>　UNTIL < condition>　which < condition>　is cyclic conditions, ie, the conditions are not set up Repeat the body of the loop < sequence of statements>　 conditions are true, the loop ends. (3) increase the one-dimensional array of type (6 instructions)