编译原理词法分析报告(C++)(2)

我做编译原理写的,希望对你有帮助。

{ m_ch=getnextchar(); } m_row++; m_col=0; m_ch=getnextchar(); m_col++; } else if(m_ch=='*')//块注释 { m_ch=getnextchar(); m_col++; while(1) { if(m_ch=='*') { m_ch=getnextchar(); m_col++; if(m_ch=='/') { m_ch=getnextchar(); break; } } m_ch=getnextchar(); } } else { m_words.str="/"; m_words.GrammarWords='/'; m_words.type=tokentype::DIV; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } } else if(m_ch=='=') { m_ch=getnextchar(); m_col++; if(m_ch=='=') {

我做编译原理写的,希望对你有帮助。

m_words.GrammarWords = 'o'; m_words.type=tokentype::EQ; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); m_ch=getnextchar(); m_col++; } else { m_words.str="="; m_words.GrammarWords = '='; m_words.type=tokentype::ASSIGN; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } } else if(m_ch=='!') { m_ch=getnextchar(); m_col++; if(m_ch=='=') { m_words.str="!="; m_words.GrammarWords = 'p'; m_words.type=tokentype::NE; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); m_ch=getnextchar(); m_col++; } else { m_words.str="!"; m_words.GrammarWords = '!'; m_words.type=tokentype::NOT; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } }

我做编译原理写的,希望对你有帮助。

{ m_ch=getnextchar(); m_col++; if(m_ch=='=') { m_words.str="<="; m_words.GrammarWords = 'q'; m_words.type=tokentype::LE; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); m_ch=getnextchar(); m_col++; } else { m_words.str="<"; m_words.GrammarWords = '<'; m_words.type=tokentype::LT; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } } else if(m_ch=='>') { m_ch=getnextchar(); m_col++; if(m_ch=='=') { m_words.str=">="; m_words.GrammarWords = 'r'; m_words.type=tokentype::GE; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); m_ch=getnextchar(); m_col++; } else { m_words.str=">";

我做编译原理写的,希望对你有帮助。

m_words.type=tokentype::GT; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } } else if(m_ch=='&') { m_ch=getnextchar(); m_col++; m_words.str="&&"; m_words.GrammarWords = 'n'; m_words.type=tokentype::ADD; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); m_ch=getnextchar(); m_col++; } else if(m_ch=='|') { m_ch=getnextchar(); m_col++; m_words.str="||"; m_words.GrammarWords = 'm'; m_words.type=tokentype::OR; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); m_ch=getnextchar(); m_col++; } else if(m_ch=='(') { m_ch=getnextchar(); m_col++; m_words.str="("; m_words.GrammarWords = '('; m_words.type=tokentype::LPAREN;//左圆括号 m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); }

我做编译原理写的,希望对你有帮助。

{ m_ch = getnextchar(); m_col++; m_words.str = ")"; m_words.GrammarWords = ')'; m_words.type = tokentype::RPAREN;//右圆括号 m_words.row = m_row; m_words.col = m_col - 1; m_wordList.AddTail(m_words); } else if(m_ch=='[') { m_ch=getnextchar(); m_col++; m_words.str="["; m_words.GrammarWords = '['; m_words.type=tokentype::LBRACKET;/*左方括号*/ m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } else if(m_ch==']') { m_ch=getnextchar(); m_col++; m_words.str="]"; m_words.GrammarWords = ']'; m_words.type=tokentype:: RBRACKET;/*右方括号*/ m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } else if(m_ch=='{') { m_ch=getnextchar(); m_col++; m_words.str="{"; m_words.GrammarWords = '{'; m_words.type=tokentype::LBRACE;//左花括号 m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); }

我做编译原理写的,希望对你有帮助。

} } { m_ch=getnextchar(); m_col++; m_words.str="}"; m_words.GrammarWords = '}'; m_words.type=tokentype::RBRACE;//左花括号 m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } else if(m_ch==',') { m_ch=getnextchar(); m_col++; m_words.str=","; m_words.GrammarWords = ','; m_words.type=tokentype::COMMA; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } else if(m_ch==';') { m_ch=getnextchar(); m_col++; m_words.str=";"; m_words.GrammarWords = ';'; m_words.type=tokentype::SEMI; m_words.row=m_row; m_words.col=m_col-1; m_wordList.AddTail(m_words); } else { currenttoken=tokentype::_ERROR; m_error=TRUE; m_ch=getnextchar(); m_col++; }

六、实验结果

我做编译原理写的,希望对你有帮助。

（1）测试代码

void main()

{

int i = 10;

int j = 0;

int max;

scanf(i);

scanf(j);

if(i>j)

{

max=i;

}

else

{

max=j;

}

printf(max);

}

2. 处理结果

我做编译原理写的,希望对你有帮助。

七、实验总结

通过这次实验，我对词法分析的理解更深刻了。

实验过程比较顺利，但仍遇到一些问题，比如为什么整型数据在token表里输出不直观。这些问题我会记在本子上，课后多花时间去弄懂。