fork download
copy 
  1.  
  2. #include <stdio.h>
  3. #include <stdbool.h>
  4. #include <string.h>
  5.  
  6. bool recognize_string(char *string)
  7. {
  8.     int len = strlen(string);
  9.     int i = 0;
  10.     while (string[i] == 'a')
  11.         {
  12.             i++;
  13.         }
  14.     if (i == len)
  15.         {
  16.             return false;
  17.         }
  18.     while (string[i] == 'b')
  19.         {
  20.             i++;
  21.         }
  22.     if (i == len)
  23.         {
  24.             return true;
  25.         }
  26.     return false;
  27. }
  28.  
  29. int main()
  30. {
  31.     char string[100];
  32.     printf("Enter a string: ");
  33.     scanf("%s", string);
  34.     if (recognize_string(string))
  35.         {
  36.             printf("%s matches the rule a^*b^+\n", string);
  37.         }
  38.     else
  39.         {
  40.             printf("%s does not match the rule a^*b^+\n", string);
  41.         }
  42.     return 0;
  43. }
Success #stdin #stdout 0s 5532KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Enter a string:  does not match the rule a^*b^+
https://ideone.com/2RsUIr
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!