%{
#include <stdio.h>
#include <math.h>
%}
 
DIGIT [0-9]
 
%%
 
{DIGIT}+    {
    int num = atoi(yytext); // Convert the matched string to an integer
    int originalNum = num;
    int numDigits = 0;
    int sum = 0;
 
    // Count the number of digits
    while (num > 0) {
        num /= 10;
        numDigits++;
    }
 
    num = originalNum; // Reset num to its original value
 
    // Calculate the sum of digits raised to the power of the number of digits
    while (num > 0) {
        int digit = num % 10;
        sum += pow(digit, numDigits);
        num /= 10;
    }
 
    if (sum == originalNum) {
        printf("%s is an Armstrong number.\n", yytext);
    } else {
        printf("%s is not an Armstrong number.\n", yytext);
    }
}
 
.|\n        ; // Ignore any other characters
 
%%
 
int main() {
    yylex();
    return 0;
}
 

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