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  1. #include<stdio.h>
  2. #include<string.h>
  3.  
  4. int main()
  5. {
  6.     char str[50];
  7.     int len;
  8.     int flag = 0;
  9.  
  10.     scanf("%s", str);
  11.  
  12.     len = strlen(str);
  13.  
  14.     if(len==1 && str[0]=='a')
  15.     {
  16.         printf("string belongs to language: a\n");
  17.         flag = 1;
  18.     }
  19.  
  20.     else if(len==3 && str[0]=='a' && str[1]=='b' && str[2]=='b')
  21.     {
  22.         printf("string belongs to language: abb\n");
  23.         flag = 1;
  24.     }
  25.  
  26.     else
  27.     {
  28.         int i = 0;
  29.         int ac = 0, bc = 0;
  30.  
  31.         while(i<len && str[i]=='a')
  32.         {
  33.             ac++;
  34.             i++;
  35.         }
  36.         while(i<len && str[i]=='b')
  37.         {
  38.             bc++;
  39.             i++;
  40.         }
  41.  
  42.         if(i==len && bc>=1)
  43.         {
  44.             printf("string belongs to language: a*b+\n");
  45.             flag = 1;
  46.         }
  47.     }
  48.  
  49.     if(flag==0)
  50.     {
  51.         printf("string does not belong to any language\n");
  52.     }
  53.  
  54.     return 0;
  55. }
Success #stdin #stdout 0.01s 5316KB
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stdin
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abb
stdout
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string belongs to language: abb
https://ideone.com/BzAaSB
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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