import re
 
def classify_token(token):
    if re.match(r'\"(\\.|[^"\\])*\"', token): return "Token: string constant"
    if token in {"int", "float", "char"}: return f"Token: {token}"
    if token in {"(", ")", "{", "}", "#", "<", ">", ";", ",", "=", "+", "-", "*", "/"}: return f"Token: {token} operator"
    if re.match(r'^[a-zA-Z_]\w*$', token): return "Token: identifier"
    if re.match(r'^\d+$', token): return "Token: Integer value"
    if re.match(r'^\d+\.\d+$', token): return "Token: Float value"
    return "Unknown Token"
 
code = '''#include <stdio.h>
int main() {
    printf("Welcome");
    return 0;
}'''
 
tokens = re.findall(r'\"(\\.|[^"\\])*\"|\w+|[^\w\s]', code)
for token in tokens:
    print(classify_token(token))
 
 

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