use yacc and flex to generate the parser tree for smallC

compiler\a
........\a.c
........\a.c~
........\a.out
........\a.out~
........\a.txt
........\a1.out
........\B.C
........\B.C~
........\b.l
........\b.l~
........\ex.l
........\ex.l~
........\..ample\a.c
........\.......\lex
........\.......\lex.l
........\.......\lex.l~
........\.......\lex.yy.c
........\.......\y.tab.c
........\.......\y.tab.h
........\.......\yacc.y
........\.......\yacc.y~
........\lex.yy.c
........\lex.yy.c~
........\lexcial.l
........\main
........\makefile
........\MakeFile~
........\node\node.h
........\....\node.h~
........\parser
........\....._tree\a.c
........\..........\a.c~
........\..........\a.out
........\..........\a.out~
........\..........\a1.c
........\..........\a1.c~
........\..........\a1.out
........\..........\lex.yy.c
........\..........\makefile
........\..........\makefile~
........\..........\parser
........\..........\smallC.l
........\..........\smallC.l~
........\..........\smallC.y
........\..........\smallC.y~
........\..........\treeNode.c
........\..........\treeNode.c~
........\..........\treeNode.h
........\..........\y.output
........\..........\y.tab.c
........\..........\y.tab.h
........\ret
........\smallC
........\smallC.l~
........\smallC.y
........\smallC.y~
........\smallC1.l
........\smallC1.l~
........\smallC3.y
........\smallC3.y~
........\.tack\main
........\.....\main.c
........\.....\main.c~
........\.....\stack.h
........\.....\stack.h~
........\.....\treeNode.h
........\.....\treeNode.h~
........\stack.c
........\stack.c~
........\stack.h
........\stack.h~
........\test.txt
........\test.txt~
........\.oken_identify\a.c
........\..............\a.out
........\..............\lex.yy.c
........\..............\smallC
........\..............\smallC.l
........\..............\smallC.l~
........\..............\smallC.y
........\..............\y.tab.c
........\..............\y.tab.h
........\.ree\a.c
........\....\node.h
........\....\node.h~
........\....\tree.h
........\....\tree.h~
........\....\无标题文档~
........\treeNode.c~
........\treeNode.h~
........\y.tab.c
........\y.tab.h
........\yacc.y
........\yacc.y~
........\修改语法
........\修改语法~
........\example
........\node
........\parse_tree

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