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編譯器的虛擬yacc工具

To do a visualization type:
    ch3-03.out < <input_string>

input1:

x = 3 * 2
y = x + 1
3 * y

input2:
3 * (2 + 4)
x = 24
y = x + 1
3 * y
2 + x + y