import re
 
def classify_token(token):
    if re.match(r'^[a-zA-Z_]\w*$', token): return "Identifier"
    if token in {"int", "float", "char"}: return "Keyword"
    if re.match(r'^\d+$', token): return "Integer"
    if re.match(r'^\d+\.\d+$', token): return "Float"
    if token in {'+', '-', '*', '/', '=', '<', '>'}: return "Operator"
    return "Unknown"
 
# Input C code as a string
c_code = '''
#include<stdio.h>
int main() {
   printf("Welcome");
   return 0;
}
'''
 
# Tokenize the input string
tokens = re.findall(r'\w+|[^\w\s]', c_code)
 
# Classify and print each token
for token in tokens:
    print(f"Token: {classify_token(token)}")
 

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