%{
 #include<stdio.h>
%}
 
%%
[\n] {printf("\n\nPls give the input: ");}
 
auto|double|int|struct|break|else|long|switch|case|enum|register|typedef|char|extern|return|union|continue|for|signed|void|do|if|static|while|default|goto|sizeof|volatile|const|float|short {printf("This is Keywords");}
 
[a-z A-Z _][a-z A_Z 0-9 _]* {printf("This is Identifier");}
 
[0-9]* {printf("This is Number");}
 
[+-/*%=] {printf("This is Operator");}
 
.* {printf("Invalid");}
 
%%
 
main()
{
 printf("\nPls give the input: ");
 yylex();
 return 0;
}

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ZG91Ymxl

double