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11 changes: 9 additions & 2 deletions Lab/Code/lexical.l
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,12 @@ illID {digit}({letter_}|{digit})*
";" {yylval=create_node(_SEMI);yylval->line=yylineno;return SEMI;}
"," {yylval=create_node(_COMMA);yylval->line=yylineno;return COMMA;}
"=" {yylval=create_node(_ASSIGNOP);yylval->line=yylineno;return ASSIGNOP;}
">"|"<"|">="|"<="|"=="|"!=" {yylval=create_node(_RELOP);yylval->line=yylineno;return RELOP;}
">" {yylval=create_node(_GT);yylval->line=yylineno;return GT;}
"<" {yylval=create_node(_LT);yylval->line=yylineno;return LT;}
"==" {yylval=create_node(_EQ);yylval->line=yylineno;return EQ;}
">=" {yylval=create_node(_GE);yylval->line=yylineno;return GE;}
"<=" {yylval=create_node(_LE);yylval->line=yylineno;return LE;}
"!=" {yylval=create_node(_NE);yylval->line=yylineno;return NE;}
"+" {yylval=create_node(_PLUS);yylval->line=yylineno;return PLUS;}
"-" {yylval=create_node(_MINUS);yylval->line=yylineno;return MINUS;}
"*" {yylval=create_node(_STAR);yylval->line=yylineno;return STAR;}
Expand All @@ -49,6 +54,8 @@ illID {digit}({letter_}|{digit})*
"if" {yylval=create_node(_IF);yylval->line=yylineno;return IF;}
"else" {yylval=create_node(_ELSE);yylval->line=yylineno;return ELSE;}
"while" {yylval=create_node(_WHILE);yylval->line=yylineno;return WHILE;}
"for" {yylval=create_node(_FOR);yylval->line=yylineno;return FOR;}
"do" {yylval=create_node(_DO);yylval->line=yylineno;return DO;}
{int} {yylval=create_node(_INT);yylval->line=yylineno;yylval->value_i=get_value(yytext);return INT;}
{float} {yylval=create_node(_FLOAT);yylval->line=yylineno;yylval->value_f=strtof(yytext,NULL);return FLOAT;}
{id} {yylval=create_node(_ID);yylval->line=yylineno;strcpy(yylval->name,yytext);return ID;}
Expand All @@ -69,4 +76,4 @@ int get_value(const char* p)
value=strtol(p,NULL,16);
else value=strtol(p,NULL,8);
return (int)value;
}
}
133 changes: 71 additions & 62 deletions Lab/Code/syntax.y
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Original file line number Diff line number Diff line change
Expand Up @@ -5,16 +5,17 @@
#endif
#define YYERROR_VERBOSE 1
Node* head=NULL;
int yyerror(const char* msg);
void m_yyerror(char* msg,int lineno);
char message[100];
%}
%locations
/*1 Tokens*/
%token SEMI COMMA ASSIGNOP RELOP
%token SEMI COMMA ASSIGNOP GT LE LT EQ NE GE
%token PLUS MINUS STAR DIV
%token AND OR DOT NOT TYPE
%token LP RP LB RB LC RC
%token STRUCT RETURN IF ELSE WHILE
%token STRUCT RETURN IF ELSE WHILE FOR DO
%token ID INT FLOAT
/*优先级，结合性*/
%nonassoc LOWER_THAN_ELSE
Expand All @@ -34,10 +35,10 @@ Program : ExtDefList {$$=create_node(Program);construct($$,1,$1);head=$$;}
ExtDefList : ExtDef ExtDefList {$$=create_node(ExtDefList);construct($$,2,$1,$2);}
| /* empty */ {$$=create_node(ExtDefList);construct($$,1,create_node(None));}
;
ExtDef : Specifier ExtDecList SEMI {$$=create_node(ExtDef);construct($$,3,$1,$2,$3);}
| Specifier SEMI {$$=create_node(ExtDef);construct($$,2,$1,$2);}
| Specifier FunDec CompSt {$$=create_node(ExtDef);construct($$,3,$1,$2,$3);}
| Specifier error SEMI {$$=create_node(ExtDef);construct($$,3,$1,create_node(None),$3);
ExtDef : TypeSpecifier ExtDecList SEMI {$$=create_node(ExtDef);construct($$,3,$1,$2,$3);}
| TypeSpecifier SEMI {$$=create_node(ExtDef);construct($$,2,$1,$2);}
| TypeSpecifier FunDec CompSt {$$=create_node(ExtDef);construct($$,3,$1,$2,$3);}
| TypeSpecifier error SEMI {$$=create_node(ExtDef);construct($$,3,$1,create_node(None),$3);
m_yyerror("something wrong with ExtDecList before \";\"",@2.last_line);}
| error SEMI {$$=create_node(ExtDef);construct($$,2,create_node(None),$2);
m_yyerror("something wrong with Specifier before \";\"",@1.last_line);}
Expand All @@ -46,10 +47,10 @@ ExtDecList : VarDec {$$=create_node(ExtDecList);construct($$,1,$1);}
| VarDec COMMA ExtDecList {$$=create_node(ExtDecList);construct($$,3,$1,$2,$3);}
;
/*3 Specifiers*/
Specifier : TYPE {$$=create_node(Specifier);construct($$,1,$1);}
| StructSpecifier {$$=create_node(Specifier);construct($$,1,$1);}
TypeSpecifier : TYPE {$$=create_node(TypeSpecifier);construct($$,1,$1);}
| StructSpecifier {$$=create_node(TypeSpecifier);construct($$,1,$1);}
;
StructSpecifier : STRUCT OptTag LC DefList RC {$$=create_node(StructSpecifier);construct($$,5,$1,$2,$3,$4,$5);}
StructSpecifier : STRUCT OptTag LC VarDeclaration RC {$$=create_node(StructSpecifier);construct($$,5,$1,$2,$3,$4,$5);}
| STRUCT Tag {$$=create_node(StructSpecifier);construct($$,2,$1,$2);}
;
OptTag : ID {$$=create_node(OptTag);construct($$,1,$1);}
Expand All @@ -75,87 +76,95 @@ VarList : ParamDec COMMA VarList {$$=create_node(VarList);construct($$,3,$1,$2,$
| error COMMA VarList {$$=create_node(VarList);construct($$,3,create_node(None),$2,$3);
m_yyerror("something wrong with ParamDec",@1.last_line);}
;
ParamDec : Specifier VarDec {$$=create_node(ParamDec);construct($$,2,$1,$2);}
ParamDec : TypeSpecifier VarDec {$$=create_node(ParamDec);construct($$,2,$1,$2);}
;
/*5 Statements*/
CompSt : LC DefList StmtList RC {$$=create_node(CompSt);construct($$,4,$1,$2,$3,$4);}
CompSt : LC VarDeclaration StmtList RC {$$=create_node(CompSt);construct($$,4,$1,$2,$3,$4);}
| error RC {$$=create_node(CompSt);construct($$,2,create_node(None),$2);
m_yyerror("Missing \"{\"",@1.first_line);}
;
StmtList : Stmt StmtList {$$=create_node(StmtList);construct($$,2,$1,$2);}
| /* empty */ {$$=create_node(StmtList);construct($$,1,create_node(None));}
;
Stmt : Exp SEMI {$$=create_node(Stmt);construct($$,2,$1,$2);}
Stmt : Expr SEMI {$$=create_node(Stmt);construct($$,2,$1,$2);}
| error SEMI {$$=create_node(Stmt);construct($$,2,create_node(None),$2);
m_yyerror("something wrong with expression before \";\"",@1.last_line);}
| CompSt {$$=create_node(Stmt);construct($$,1,$1);}
| RETURN Exp SEMI {$$=create_node(Stmt);construct($$,3,$1,$2,$3);}
| RETURN Expr SEMI {$$=create_node(Stmt);construct($$,3,$1,$2,$3);}
| RETURN error SEMI {$$=create_node(Stmt);construct($$,3,$1,create_node(None),$3);
m_yyerror("something wrong with expression before \";\"",@2.last_line);}
| IF LP Exp RP Stmt %prec LOWER_THAN_ELSE {$$=create_node(Stmt);construct($$,5,$1,$2,$3,$4,$5);}
| IF LP Expr RP Stmt %prec LOWER_THAN_ELSE {$$=create_node(Stmt);construct($$,5,$1,$2,$3,$4,$5);}
| IF LP error RP Stmt %prec LOWER_THAN_ELSE{$$=create_node(Stmt);construct($$,5,$1,$2,create_node(None),$4,$5);
m_yyerror("something wrong with expression between ()",@3.last_line);}
| IF LP Exp RP Stmt ELSE Stmt {$$=create_node(Stmt);construct($$,7,$1,$2,$3,$4,$5,$6,$7);}
| IF LP Exp RP error ELSE Stmt {$$=create_node(Stmt);construct($$,7,$1,$2,$3,$4,create_node(None),$6,$7);
| IF LP Expr RP Stmt ELSE Stmt {$$=create_node(Stmt);construct($$,7,$1,$2,$3,$4,$5,$6,$7);}
| IF LP Expr RP error ELSE Stmt {$$=create_node(Stmt);construct($$,7,$1,$2,$3,$4,create_node(None),$6,$7);
m_yyerror("Missing \";\"",@5.last_line);}
| IF LP error RP Stmt ELSE Stmt {$$=create_node(Stmt);construct($$,7,$1,$2,create_node(None),$4,$5,$6,$7);
m_yyerror("something wrong with expression between ()",@3.last_line);}
| WHILE LP Exp RP Stmt {$$=create_node(Stmt);construct($$,5,$1,$2,$3,$4,$5);}
| WHILE LP error RP Stmt {$$=create_node(Stmt);construct($$,5,$1,$2,create_node(None),$4,$5);
m_yyerror("something wrong with expression between ()",@3.last_line);}
| IF error RP Stmt %prec LOWER_THAN_ELSE {$$=create_node(Stmt);construct($$,4,$1,create_node(None),$3,$4);
m_yyerror("missing \"(\"",@2.last_line);}
| IF error RP Stmt ELSE Stmt {$$=create_node(Stmt);construct($$,6,$1,create_node(None),$3,$4,$5,$6);
m_yyerror("missing \"(\"",@2.last_line);}
| WHILE error RP Stmt {$$=create_node(Stmt);construct($$,4,$1,create_node(None),$3,$4);
m_yyerror("missing \"(\"",@2.last_line);}
;
//循环语句部分
RepeatStatement: WHILE LP Expr RP StmtCompoundStatement {$$=create_node(RepeatStatement);construct($$,5,$1,$2,$3,$4,$5);}
| WHILE LP error RP CompoundStatement {$$=create_node(RepeatStatement);construct($$,5,$1,$2,create_node(None),$4,$5);
m_yyerror("something wrong with expression between ()",@3.last_line);}
| WHILE error RP CompoundStatement {$$=create_node(RepeatStatement);construct($$,4,$1,create_node(None),$3,$4);
m_yyerror("missing \"(\"",@2.last_line);}
| FOR LP Expr SEMI Expr SEMI Expr RP CompoundStatement { $$=create_node(RepeatStatement);;construct($$,9,$1,$2,$3,$4,$5,$6,$7,$8,$9);}
| FOR LP SEMI Expr SEMI Expr RP CompoundStatement { $$=create_node(RepeatStatement);;construct($$,8,$1,$2,$3,$4,$5,$6,$7,$8);}
| FOR LP Expr SEMI SEMI Expr RP CompoundStatement { $$=create_node(RepeatStatement);;construct($$,8,$1,$2,$3,$4,$5,$6,$7,$8);}
| FOR LP Expr SEMI Expr SEMI RP CompoundStatement { $$=create_node(RepeatStatement);;construct($$,8,$1,$2,$3,$4,$5,$6,$7,$8);}
| FOR LP SEMI SEMI Expr RP CompoundStatement { $$=create_node(RepeatStatement);;construct($$,7,$1,$2,$3,$4,$5,$6,$7);}
| FOR LP SEMI Expr SEMI RP CompoundStatement { $$=create_node(RepeatStatement);;construct($$,7,$1,$2,$3,$4,$5,$6,$7);}
| FOR LP Expr SEMI SEMI RP CompoundStatement { $$=create_node(RepeatStatement);;construct($$,7,$1,$2,$3,$4,$5,$6,$7);}
| FOR LP SEMI SEMI RP CompoundStatement { $$=create_node(RepeatStatement);;construct($$,6,$1,$2,$3,$4,$5,$6);}
//这里还有一些问题，就是没有for循环的错误情况处理
CompoundStatement: Stmt {$$=create_node(CompoundStatement);;construct($$,1,$1);}
|RepeatStament {$$=create_node(CompoundStatement);;construct($$,1,$1);}
//这里补充的是循环里面循环体的声明
//下面是条件选择的部分


/*6 Local Definitions*/
DefList : Def DefList {$$=create_node(DefList);construct($$,2,$1,$2);}
| /* empty */ {$$=create_node(DefList);construct($$,1,create_node(None));}
;
Def : Specifier DecList SEMI {$$=create_node(Def);construct($$,3,$1,$2,$3);}
| Specifier error SEMI {$$=create_node(Def);construct($$,3,$1,create_node(None),$3);
m_yyerror("unnecessary \",\"",@2.last_line);}
;
DecList : Dec {$$=create_node(DecList);construct($$,1,$1);}
| Dec COMMA DecList {$$=create_node(DecList);construct($$,3,$1,$2,$3);}
| error COMMA DecList {$$=create_node(DecList);construct($$,3,create_node(None),$2,$3);
m_yyerror("something wrong with declaration",@1.last_line);}
;
Dec : VarDec {$$=create_node(Dec);construct($$,1,$1);}
| VarDec ASSIGNOP Exp {$$=create_node(Dec);construct($$,3,$1,$2,$3);}
| error ASSIGNOP Exp {$$=create_node(Dec);construct($$,3,create_node(None),$2,$3);
m_yyerror("missing the variable",@1.last_line);}
VarDeclaration : TypeSpecifier Expr SEMI{$$=create_node(VarDeclaration);construct($$,2,$1,$2);}
| TypeSpecifier Expr COMMA Expr SEMI{$$=create_node(VarDeclaration);construct($$,3,$1,$2,$4);}
| /* empty */ {$$=create_node(VarDeclaration);construct($$,1,create_node(None));}
;
/*7 Expressions*/
Exp : Exp ASSIGNOP Exp {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| Exp AND Exp {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| Exp OR Exp {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| Exp RELOP Exp {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| Exp PLUS Exp {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| Exp MINUS Exp {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| Exp STAR Exp {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| Exp DIV Exp {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| LP Exp RP {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| MINUS Exp %prec NOT {$$=create_node(Exp);construct($$,2,$1,$2);}
| NOT Exp {$$=create_node(Exp);construct($$,2,$1,$2);}
| ID LP Args RP {$$=create_node(Exp);construct($$,4,$1,$2,$3,$4);}
| ID LP RP {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| Exp LB Exp RB {$$=create_node(Exp);construct($$,4,$1,$2,$3,$4);}
| Exp DOT ID {$$=create_node(Exp);construct($$,3,$1,$2,$3);}
| ID {$$=create_node(Exp);construct($$,1,$1);}
| INT {$$=create_node(Exp);construct($$,1,$1);}
| FLOAT {$$=create_node(Exp);construct($$,1,$1);}
| error RP {$$=create_node(Exp);construct($$,2,create_node(None),$2);
Expr : Expr ASSIGNOP Expr {$$=create_node(Expr);$$->value_c="=";construct($$,2,$1,$3);}
| Expr AND Expr {$$=create_node(Expr);$$->value_c="&&";construct($$,2,$1,$3);}
| Expr OR Expr {$$=create_node(Expr);$$->value_c="||";construct($$,2,$1,$3);}
| Expr GT Expr {$$=create_node(Expr);$$->value_c=">";construct($$,2,$1,$3);}
| Expr LT Expr {$$=create_node(Expr);$$->value_c="<";construct($$,2,$1,$3);}
| Expr EQ Expr {$$=create_node(Expr);$$->value_c="==";construct($$,2,$1,$3);}
| Expr GE Expr {$$=create_node(Expr);$$->value_c=">=";construct($$,2,$1,$3);}
| Expr LE Expr {$$=create_node(Expr);$$->value_c="<=";construct($$,2,$1,$3);}
| Expr NE Expr {$$=create_node(Expr);$$->value_c="!=";construct($$,2,$1,$3);}
| Expr PLUS Expr {$$=create_node(Expr);$$->value_c="+";construct($$,2,$1,$3);}
| Expr MINUS Expr {$$=create_node(Expr);$$->value_c="-";construct($$,2,$1,$3);}
| Expr STAR Expr {$$=create_node(Expr);$$->value_c="*";construct($$,2,$1,$3);}
| Expr DIV Expr {$$=create_node(Expr);$$->value_c="/";construct($$,2,$1,$3);}
| LP Expr RP {$$=create_node(Expr);construct($$,3,$1,$2,$3);}
| MINUS Expr %prec NOT {$$=create_node(Expr);construct($$,2,$1,$2);}
| NOT Expr {$$=create_node(Expr);construct($$,2,$1,$2);}
| ID LP Args RP {$$=create_node(Expr);construct($$,4,$1,$2,$3,$4);}
| ID LP RP {$$=create_node(Expr);construct($$,3,$1,$2,$3);}
| Expr LB Expr RB {$$=create_node(Expr);construct($$,4,$1,$2,$3,$4);}
| Expr DOT ID {$$=create_node(Expr);construct($$,3,$1,$2,$3);}
| ID {$$=create_node(Expr);construct($$,1,$1);}
| INT {$$=create_node(Expr);construct($$,1,$1);}
| FLOAT {$$=create_node(Expr);construct($$,1,$1);}
| error RP {$$=create_node(Expr);construct($$,2,create_node(None),$2);
m_yyerror("missing \"(\"",@1.last_line);}
| Exp LB error RB {$$=create_node(Exp);construct($$,4,$1,$2,create_node(None),$4);
| Expr LB error RB {$$=create_node(Expr);construct($$,4,$1,$2,create_node(None),$4);
m_yyerror("missing \"]\"",@3.last_line);}
| ID error RP {$$=create_node(Exp);construct($$,3,$1,create_node(None),$3);
| ID error RP {$$=create_node(Expr);construct($$,3,$1,create_node(None),$3);
m_yyerror("missing \"(\"",@2.last_line);}
;
Args : Exp COMMA Args {$$=create_node(Args);construct($$,3,$1,$2,$3);}
| Exp {$$=create_node(Args);construct($$,1,$1);}
Args : Expr COMMA Args {$$=create_node(Args);construct($$,3,$1,$2,$3);}
| Expr {$$=create_node(Args);construct($$,1,$1);}
| error COMMA Args {$$=create_node(Args);construct($$,3,create_node(None),$2,$3);
m_yyerror("something wrong with your expression",@1.last_line);}
;
Expand All @@ -180,11 +189,11 @@ int main(int argc,char** argv)
fclose(f);
return 0;
}
yyerror(char* msg) {
int yyerror(const char* msg) {
strcpy(message,msg+14);
error_occured=true;
}
void m_yyerror(char* msg,int lineno) {
printf("Error type B at Line %d: %s, maybe %s.\n",lineno,message,msg);
error_occured=true;
}
}
38 changes: 26 additions & 12 deletions Lab/Code/tree.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ static const char *const types_name_table[] =
/*0 Epsilon*/
"None",
/*1 Tokens*/
"SEMI","COMMA","ASSIGNOP","RELOP",
"SEMI","COMMA","ASSIGNOP","GT","LT","EQ","GE","LE","NE",
"PLUS","MINUS","STAR","DIV",
"AND","OR","DOT","NOT","TYPE",
"LP","RP","LB","RB","LC","RC",
Expand All @@ -15,15 +15,15 @@ static const char *const types_name_table[] =
/*2 High-level Definitions*/
"Program","ExtDefList","ExtDef","ExtDecList",
/*3 Specifiers*/
"Specifier","StructSpecifier","OptTag","Tag",
"TypeSpecifier","StructSpecifier","OptTag","Tag",
/*4 Declarators*/
"VarDec","FunDec","VarList","ParamDec",
/*5 Statements*/
"CompSt","StmtList","Stmt",
/*6 Local Definitions*/
"DefList","Def","DecList","Dec",
"VarDeclaration",
/*7 Expressions*/
"Exp","Args"
"Expr","Args"
};
const char* get_type_name(Types type)
{
Expand All @@ -41,6 +41,7 @@ Node* create_node(Types type)
p->value_f=0.0;
p->type=type;
p->name[0]='\0';
p->value_c="";
p->line=-1;
p->father=NULL;
p->child_count=0;
Expand Down Expand Up @@ -77,19 +78,32 @@ void print_tree(Node* p)
if(p==NULL)return;
if(p->line==-1)return;
depth++;
if(get_type_name(p->type)=="Program")
printf("*");
for(int i=0;i<depth;i++)
printf(" ");
printf("%s",get_type_name(p->type));
if(p->type>_FLOAT)
printf(" (%d)",p->line);
else if(p->type==_ID || p->type==_TYPE)
printf(": %s",p->name);
if(p->type==_INT||p->type==_FLOAT)
printf("ConstDeclaration");
else if(p->type==Expr && p->value_c!="")
printf("Expr,op:");
else if(p->type==Expr)
printf("Expr");
else
printf("%s",get_type_name(p->type));
//根据type索引到type_name
if(p->type==_ID )
printf(",symbol: %s",p->name);
else if(p->type==_TYPE )
printf(", %s",p->name);
else if(p->type==_INT)
printf(": %d",p->value_i);
printf(", %d",p->value_i);
else if(p->type==_FLOAT)
printf(": %f",p->value_f);
printf(", %f",p->value_f);
else if(p->type==Expr)
printf(" %s",p->value_c);
//这部分打印的是id名，int类型数据的值什么的
printf("\n");
for(int i=0;i<p->child_count;i++)
print_tree(p->child[i]);
depth--;
}
}
11 changes: 6 additions & 5 deletions Lab/Code/tree.h
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ typedef enum Types
/*0 Epsilon*/
None,
/*1 Tokens*/
_SEMI,_COMMA,_ASSIGNOP,_RELOP,
_SEMI,_COMMA,_ASSIGNOP,_GT,_LT,_EQ,_GE,_LE,_NE,
_PLUS,_MINUS,_STAR,_DIV,
_AND,_OR,_DOT,_NOT,_TYPE,
_LP,_RP,_LB,_RB,_LC,_RC,
Expand All @@ -20,15 +20,15 @@ typedef enum Types
/*2 High-level Definitions*/
Program,ExtDefList,ExtDef,ExtDecList,
/*3 Specifiers*/
Specifier,StructSpecifier,OptTag,Tag,
TypeSpecifier,StructSpecifier,OptTag,Tag,
/*4 Declarators*/
VarDec,FunDec,VarList,ParamDec,
/*5 Statements*/
CompSt,StmtList,Stmt,
/*6 Local Definitions*/
DefList,Def,DecList,Dec,
VarDeclaration,
/*7 Expressions*/
Exp,Args
Expr,Args
}Types;
typedef struct Node
{
Expand All @@ -37,6 +37,7 @@ typedef struct Node
int line;//行号
int value_i;//整形数值
float value_f;//浮点形数值
char* value_c;
struct Node* father;//父节点
int child_count;//字节点的数量
struct Node* child[MAX_COUNT_OF_CHILD];
Expand All @@ -46,4 +47,4 @@ Node* create_node(Types type);
void destroy_tree(Node* head);
void construct(Node* father,int n,...);
void print_tree(Node* head);
const char* get_type_name(Types type);
const char* get_type_name(Types type);
4 changes: 2 additions & 2 deletions Lab/Test/test5.cmm
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
int main()
{
int i = 0123;
int j = 0x3F;
}
i > 2;
}
9 changes: 9 additions & 0 deletions Lab/Test/test7.cmm
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
void main()
{
int a = 2, b;
while (a > 0) {
a = a -1;
}
print(a);
}