lex:converting hex to dec

Question

I am trying to build a simple lexical analysis with flex and bison, but I have a problem with converting hex to dec in my lexer.l. Here are my codes.

hex (0)([x]|[X])([0-9][A-Fa-f])+

{hex}{count++;printf("%d\t(hex,%s)\n",count,yytext);}

Answer 1

ohhh！I solved the problem! I just need to add two functions like c program and change the type of my output.

{hex} {count++;printf("%d\t(hex,%d)\n",count,hextodec(yytext));}
{oct} {count++;printf("%d\t(oct,%d)\n",count,octtodec(atoi(yytext)));}



int octtodec(int oct){
 int dec=0,pos=0;
 while (oct){
     int a=oct%10;
     dec += a * pow(8,pos);
     pos++;
     oct /= 10;
 }
 return dec;}

 int hextodec(char *hex){
 int dec=0,pos=0;
 int len;
 len=strlen(hex);
 for (int i =2;i<len;i++){
     if(hex[i]>='a'&&hex[i]<='f'){
         dec=dec+(hex[i]-'a'+10)*pow(16,len-i-1);
     }
     else if(hex[i]>='A'&&hex[i]<='F'){
         dec=dec+(hex[i]-'A'+10)*pow(16,len-i-1);
     }
     else{
         dec+=(hex[i]-'0')*pow(16,len-i-1);
     }
 }
 return dec;}