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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include<bits/stdc++.h>
  4. using namespace std;
  5. char keyword[32][10]=
  6. {
  7.     "auto","double","int","struct","break","else","long",
  8.     "switch","case","enum","register","typedef","char",
  9.     "extern","return","union","const","float","short",
  10.     "unsigned","continue","for","signed","void","default",
  11.     "goto","sizeof","voltile","do","if","static","while"
  12. } ;
  13.  
  14. int is_valid(char str[])
  15. {
  16.     if (isdigit(str[0]))
  17.         return 0;
  18.     int i = 0;
  19.     while(str[i]!='\0')
  20.     {
  21.         char ch = str[i];
  22.         if(!isdigit(ch) && !isalpha(ch) && ch!='-')
  23.             return 0;
  24.         i++;
  25.     }
  26.  
  27.     return 1;
  28. }
  29. int is_keyword(char s[])
  30. {
  31.     int i = 0;
  32.     for (i = 0 ; i< 32 ; i++)
  33.     {
  34.         if(strcmp(keyword[i],s)==0)
  35.             return 0;
  36.     }
  37.     return 1;
  38. }
  39. int main()
  40. {
  41.  
  42.     char str[100];
  43.     char key[100];
  44.  
  45.  
  46.     int i,a=0;
  47.     int space=0;
  48.     printf("Enter a string\n");
  49.     scanf("%[^.]s",str);
  50.  
  51.  
  52.  
  53.  
  54.     char sp[] = " ";
  55.     char words[100][100] , valid_words[100][100] , invalid_words[100][100];
  56.     char *ptr = strtok(str, sp);
  57.     int ind = 0;
  58.  
  59.  
  60.     while(ptr != NULL)
  61.     {
  62.  
  63.         strcpy(words[ind++], ptr);
  64.         ptr = strtok(NULL, sp);
  65.  
  66.  
  67.  
  68.     }
  69.  
  70.  
  71.  
  72.  
  73.  
  74.     int ind1 = 0, ind2=0;
  75.     for(i= 0 ; i<ind ; i++)
  76.     {
  77.         if(is_keyword(words[i])==1)
  78.             if(is_valid(words[i])==1)
  79.             {
  80.                 strcpy(valid_words[ind1++], words[i]);
  81.             }
  82.             else
  83.             {
  84.                  strcpy(invalid_words[ind2++], words[i]);
  85.             }
  86.     }
  87.  
  88.    printf("\n\nValid Identifiers: ");
  89.    for( i= 0; i< ind1 ; i++)
  90.     {
  91.         if(i!=ind1-1)
  92.         {
  93.             printf("%s ,",valid_words[i]);
  94.         }
  95.         else
  96.               printf("%s",valid_words[i]);
  97.     }
  98.  
  99.     printf("\n\nInvalid Identifiers: ");
  100.     for( i= 0; i< ind2 ; i++)
  101.     {
  102.         if(i!=ind2-1)
  103.         {
  104.             printf("%s ,",invalid_words[i]);
  105.         }
  106.         else
  107.               printf("%s",invalid_words[i]);
  108.     }
  109.  
  110.  
  111.     printf("\n\nKeywords: \n");
  112.     for(i= 0 ; i<ind ; i++)
  113.     {
  114.         if(is_keyword(words[i])==0)
  115.             printf("%s\n", words[i]);
  116.     }
  117.  
  118.  
  119. }
  120.  
  121.  
Success #stdin #stdout 0s 5504KB
comments (?)
stdin
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CSE 411
Compliler Sessional
Adnan if 
goto
if else.
stdout
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Enter a string


Valid Identifiers: CSE

Invalid Identifiers: 411
Compliler ,Sessional
Adnan ,
goto
if

Keywords: 
if
else
https://ideone.com/JJsD3K
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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