%{
    #include<stdio.h>
    FILE*out;
%}
%%
"/*"([^*]|\*+[^*/])*\*+"/"     {/*ignore*/}
"//".*  {//ignore}
.|\n  {fprintf(out,"%s",yytext);}
%%
int yywrap(){
    return 1;
}
int main(){
    out=fopen("out.c","w");
    if(out==NULL){
        printf("error");
        return 0;
    }
    printf("enter c code:\n");
    yylex();
    fclose(out);
    return 0;
}