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  1. l#include <stdio.h>
  2. #include <string.h>
  3. #include <ctype.h>
  4.  
  5. void keyword(char str[])
  6. {
  7.     const char *keys[] = {
  8.         "for","while","do","int","float","char","double",
  9.         "static","switch","case","return","if","else","break","continue"
  10.     };
  11.     int n = sizeof(keys)/sizeof(keys[0]);
  12.  
  13.     for(int i=0;i<n;i++)
  14.         if(strcmp(str,keys[i])==0) {
  15.             printf("\n%s is a keyword",str);
  16.             return;
  17.         }
  18.     printf("\n%s is an identifier",str);
  19. }
  20.  
  21. int main()
  22. {
  23.     FILE *f1,*f2,*f3;
  24.     char c, str[50];
  25.     int num[100], lineno=1, tokenvalue=0;
  26.     int i=0,j=0,k=0;
  27.  
  28.     printf("Enter the C program (Ctrl+D to end):\n");
  29.  
  30.     f1 = fopen("input.c","w");
  31.     while((c=getchar())!=EOF)
  32.         putc(c,f1);
  33.     fclose(f1);
  34.  
  35.     f1 = fopen("input.c","r");
  36.     f2 = fopen("identifiers.txt","w");
  37.     f3 = fopen("specialchar.txt","w");
  38.  
  39.     while((c=getc(f1))!=EOF)
  40.     {
  41.         if(isdigit((unsigned char)c))
  42.         {
  43.             tokenvalue = c - '0';
  44.             while(isdigit((unsigned char)(c=getc(f1))))
  45.                 tokenvalue = tokenvalue*10 + (c-'0');
  46.             num[i++] = tokenvalue;
  47.             ungetc(c,f1);
  48.         }
  49.         else if(isalpha((unsigned char)c) || c=='_')
  50.         {
  51.             putc(c,f2);
  52.             while(isalnum((unsigned char)(c=getc(f1))) || c=='_')
  53.                 putc(c,f2);
  54.             putc(' ',f2);
  55.             ungetc(c,f1);
  56.         }
  57.         else if(c==' ' || c=='\t') { }
  58.         else if(c=='\n') lineno++;
  59.         else putc(c,f3);
  60.     }
  61.  
  62.     fclose(f1); fclose(f2); fclose(f3);
  63.  
  64.     printf("\nNumbers found: ");
  65.     for(j=0;j<i;j++)
  66.         printf("%d ",num[j]);
  67.  
  68.     f2=fopen("identifiers.txt","r");
  69.     printf("\n\nKeywords and Identifiers:");
  70.     k=0;
  71.     while((c=getc(f2))!=EOF)
  72.     {
  73.         if(c!=' ')
  74.             str[k++]=c;
  75.         else {
  76.             str[k]='\0';
  77.             keyword(str);
  78.             k=0;
  79.         }
  80.     }
  81.     fclose(f2);
  82.  
  83.     f3=fopen("specialchar.txt","r");
  84.     printf("\n\nSpecial characters: ");
  85.     while((c=getc(f3))!=EOF)
  86.         printf("%c",c);
  87.     fclose(f3);
  88.  
  89.     printf("\n\nTotal number of lines: %d\n", lineno);
  90.  
  91.     return 0;
  92. }
  93.  
Success #stdin #stdout #stderr 0.02s 6820KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/rG1d3r/prog:92:1: Syntax error: end_of_file_in_quasi_quotation
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/bnp05E
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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