stack calculator lex implementation

calculator.lex

%option noyywrap
%{
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
%}
%%
	int nums[100],i=0;
[\-0-9]*|[0-9]*	{
	i++;
	nums[i]=(int) strtol(yytext, (char **)NULL, 10);
	printf("%s = %d\n",yytext,nums[i]);
	}
\+	{
	printf("%d + %d = %d \n",nums[i],nums[i-1],nums[i-1]+nums[i]);
	nums[i-1]=nums[i-1]+nums[i];
	i--;
	}
\-	{
	printf("%d - %d = %d \n",nums[i],nums[i-1],nums[i-1]-nums[i]);
	nums[i-1]=nums[i-1]-nums[i];
	i--;
	}
\*	{
	printf("%d * %d = %d \n",nums[i],nums[i-1],nums[i-1]*nums[i]);
	nums[i-1]=nums[i-1]*nums[i];
	i--;
	}
\/	{
	printf("%d / %d = %d \n",nums[i],nums[i-1],nums[i-1]/nums[i]);
	nums[i-1]=nums[i-1]/nums[i];
	i--;
	}
%%
int main(){
	yylex();
}