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  1. #include <stdio.h> 
  2. #include <conio.h>
  3. #include <ctype.h>
  4.  
  5. char buffer[30];//For storing the input string
  6. int i=0;//index into the array of input string
  7. void S();
  8. void E();
  9. void T();
  10. void T1();
  11. void F();
  12. void A();
  13. void E1();
  14.  void S()
  15.    {
  16.       printf("\nThe Production S => A=E  is used");
  17.       A();
  18.       if(buffer[i]=='=')
  19.     {
  20.        printf("\n......Match the terminal =");
  21.        i++;
  22.        E();
  23.     }
  24.       else
  25.     {
  26.        printf("\nError Condition ");
  27.        exit();
  28.     }
  29.     }
  30.   void A()
  31.     {
  32.        if(isalpha(buffer[i]))
  33.       {
  34.          printf("\n......Match the terminal %c",buffer[i]);
  35.          i++;
  36.       }
  37.        else
  38.       {
  39.          printf("\nError condition");
  40.          exit();
  41.       }
  42.     }
  43.  void E()
  44.    {
  45.      printf("\nThe Production E => T E1 is used");
  46.      T();
  47.      E1();
  48.    }
  49.  void  E1()
  50.    {
  51.       if(buffer[i]=='+')
  52.      {
  53.         printf("\nThe production  E1 => +T E1 is used");
  54.         printf("\n......Match the terminal +");
  55.         i++;
  56.         T();
  57.         E1();
  58.      }
  59.       else
  60.      printf("\nThe production E1 => <Epsilon> is used");
  61.    }
  62. void T()
  63.    {
  64.      printf("\nThe Production T => F T1 is used");
  65.      F();
  66.      T1();
  67.    }
  68.  void  T1()
  69.    {
  70.       if(buffer[i]=='*')
  71.      {
  72.         printf("\nThe production  T1 => *F T1 is used");
  73.         printf("\n......Match the terminal *");
  74.         i++;
  75.         F();
  76.         T1();
  77.      }
  78.       else
  79.      printf("\nThe production T1 => <Epsilon> is used");
  80.    }
  81.   void F()
  82.     {
  83.        if(buffer[i]=='(')
  84.      {
  85.         printf("\nThe production  F => (E) is used");
  86.         printf("\n......Match the terminal (");
  87.         i++;
  88.         E();
  89.         if(buffer[i]==')')
  90.         {
  91.            printf("\n.....Match the terminal )");
  92.            i++;
  93.         }
  94.          else
  95.         {
  96.             printf("\nError condition");
  97.             exit();
  98.         }
  99.          return;
  100.       }
  101.        if(buffer[i]=='a')
  102.      {
  103.           printf("\nThe production  F => a is used");
  104.           printf("\n......Match the terminal a");
  105.           i++;
  106.           return;
  107.      }
  108.        if(buffer[i]=='b')
  109.      {
  110.           printf("\nThe production  F => b is used");
  111.           printf("\n......Match the terminal b");
  112.           i++;
  113.           return;
  114.      }
  115.        printf("\nError condition");
  116.        exit();
  117.    }
  118. void main()
  119.  {
  120.    clrscr();
  121.    printf("\nEnter input string:");
  122.    gets(buffer);
  123.    S();
  124.    printf("\nIt is a valid string");
  125.    getch();
  126.  }
  127.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.m:2:19: fatal error: conio.h: No such file or directory
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/hJVFG
language:
Objective-C (gcc 8.3)
created:
13 years ago
visibility:
public

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