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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <ctype.h>
  4.  
  5. #define SIZE 1000
  6. #define WORDS 10
  7.  
  8. int main(void)
  9. {
  10.     char message[SIZE];
  11.  
  12.     const char *spamWords[WORDS] =
  13.     {
  14.         "free",
  15.         "winner",
  16.         "win",
  17.         "prize",
  18.         "money",
  19.         "urgent",
  20.         "offer",
  21.         "click",
  22.         "buy",
  23.         "congratulations"
  24.     };
  25.  
  26.     int score = 0;
  27.  
  28.     printf("Enter an email message:\n");
  29.     fgets(message, SIZE, stdin);
  30.  
  31.     for (int i = 0; i < SIZE; ++i)
  32.     {
  33.         message[i] =
  34.             (char)tolower((unsigned char)message[i]);
  35.     }
  36.  
  37.     for (int i = 0; i < WORDS; ++i)
  38.     {
  39.         if (strstr(message, spamWords[i]) != NULL)
  40.         {
  41.             ++score;
  42.         }
  43.     }
  44.  
  45.     printf("Spam score = %d\n", score);
  46.  
  47.     if (score >= 5)
  48.     {
  49.         printf("The message is probably spam.\n");
  50.     }
  51.     else if (score >= 2)
  52.     {
  53.         printf("The message may be spam.\n");
  54.     }
  55.     else
  56.     {
  57.         printf("The message is probably not spam.\n");
  58.     }
  59.  
  60.     return 0;
  61. }
Success #stdin #stdout 0s 5356KB
comments (?)
stdin 
Standard input is empty
stdout 
Enter an email message:
Spam score = 0
The message is probably not spam.
https://ideone.com/ZFaXbe
language:
C (gcc 8.3)
created:
3 hours ago
visibility:
public

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