I really got to know this

[Parul Bagadia]

Hello,
I guess it may be related with some sort of memory organisation, but am not sure.
Nywaz, the situation is , am working in Turbo C++ compiler..am making a program to simulate an assembler, where my input is a file named "micro", which has assembly code in it and needs to be converted in assembly language by no. of steps, out of which m done with some of them and working with other steps.
Here I have taken a structure named MOT having 3 arrays out of which 1 is int and during program execution values of integer array gets change in certain areas of code, it generally happens when one array limit is exceeded but its not the case over here , value of object.r1 changes from 1 digit to 5 digits for certain indices and for certain indices it gets added by only 4-5 nos...
Here is the code..

 
#include<stdio.h>
#include<conio.h>
void main()
{
   FILE *in,*out;
   char ch;
   char store[100];
   char label[100];
   char operand[100];
   char opcode[100],directive[100];
   int get=0,add=0;
   int i=0,la=0,opr=0,opc=0,dir=0,once=0,accept=0;
   int one=0,two=0,one1=0,one2=0;
   int dir1=0,opc1=0,opr1=0,la1=0,easy=0;
   int p=0,q=0,r=0,s=0,match=0;
   int pass1=0,pass2=0,pass3=0;
   struct mot{
  char p1[80];
  char q1[40];
  int r1[];
   }object;
   clrscr();
   object.r1[0]=1;
   object.r1[1]=2;
   object.r1[2]=3;
   object.r1[3]=1;
   object.r1[4]=2;
   object.r1[5]=1;
   object.r1[6]=2;
   store[0]=NULL,label[0]=NULL,operand[0]=NULL,opcode[0]=NULL,directive[0]=NULL;
   in=fopen("micro.txt","r");
    if(in==NULL)
       printf("\nSorry,error in opening the file.\n");
    else
      {
  printf("\nSource code file opened successfully.\n");
  printf("\nDistribution of code is as follows: \n");
      while(!feof(in))
        {
    ch=getc(in);
    store[i]=ch;
    i++;
     if(ch=='\n' && once==0)
       {
         for(accept=0;accept<i-1;accept++)
   {
      directive[dir]=store[accept];
      dir++;
   }
    directive[dir]='\t';
    dir++;
    once=5;
    i=0;
    store[0]=NULL;
        }
      else if((ch=='\n' && once==5)|| ch==',')
       {
   if(ch==',')
     {
    for(accept=0;accept<i-1;accept++)
      {
         opcode[opc]=store[accept];
         opc++;
      }
      opcode[opc]='\t';
      opc++;
      i=0;
      store[0]=NULL;
      operand[opr]=fgetc(in);
      opr++;
      while(easy!=2)
       {
           operand[opr]=fgetc(in);
           if(operand[opr]=='\n')
      {
         operand[opr]='\t';
         easy=2;
      }
      opr++;
       }
       easy=0;
     }
   else
   {
        for(accept=0;accept<i-1;accept++)
          {
        opcode[opc]=store[accept];
        opc++;
          }
          i=0;
          store[0]=NULL;
          opcode[opc]='\t';
          opc++;
   }
       }
     if(ch==':')
       {
        for(accept=0;accept<i-1;accept++)
   {
      label[la]=store[accept];
      la++;
   }
   label[la]='\t';
   la++;
   i=0;
   store[0]=NULL;
        }
        }
        printf("\nDirective");
        printf("\t");
        printf("Label");
        printf("\t   ");
        printf("Opcode");
        printf("\t");
        printf("Operand");
        printf("\t\n");
        while(one!=5 || two!=5 || one1!=5 || one2!=5)
        {
       while(directive[dir1]!='\t' && dir1!=dir)
         {
     printf("%c",directive[dir1]);
     dir1++;
         }
         printf("\t");
         if(dir1==dir)
    one=5;
         if(one==5)
    printf("  ");
         else
    dir1++;
        while(label[la1]!='\t' && la1<la)
          {
    printf("%c",label[la1]);
    la1++;
         }
         printf("\t");
         if(la1==la)
          two=5;
         if(two==5)
     printf(" \t");
         else
    la1++;
       while(opcode[opc1]!='\t' && opc1<opc)
        {
          printf("%c",opcode[opc1]);
          opc1++;
        }
       printf("\t");
       if(opc1==opc)
          one1=5;
       if(one1==5)
         printf("     ");
       else
         opc1++;
       while(operand[opr1]!='\t'&& opr1<opr)
        {
          printf("%c",operand[opr1]);
          opr1++;
        }
        if(opr1==opr)
     one2=5;
        if(one2!=5)
     opr1++;
        printf("\n");
        }
      printf("\nMOT details are as follows:\n");
      strcpy(object.p1,"MVI A\tMOV A\tROL BH\tDEC CH\tJNZ NEXT\tINC SI\tNOP\t\n");
      strcpy(object.q1,"E8\tB6\t4A\t7D\t2F\tEF\t1C\t\n");
      printf("\nAddress\t Hexcode\t Symbol\t \n");
      while(1)
        {
    while(opcode[q]==' ')
    q++;
    while(object.p1[p]!='\n'&& object.p1[p]==opcode[q] && object.p1[p]!='\t' && opcode[q]!='\t')
       {
     p++;
     q++;
     continue;
       }
    if(object.p1[p]=='\n')
         break;
    else if(object.p1[p]=='\t' && opcode[q]!='\t')
    match++;
    else if(object.p1[p]!='\t' && opcode[q]=='\t')
        {
    while(object.p1[p]!=' ' && p>0)
          p--;
    if(object.p1[p]==' ')
          p++;
         }
    else if(object.p1[p]==opcode[q] &&opcode[q]=='\t')
         {
        if(pass1==match)
    {
        while(object.r1[r]!='\t')
     {
         get=object.r1[r];
         r++;
      }
      add=add+get;
      printf("%c\t",add);
         while(object.q1[s]!='\t')
       {
          printf("%c",object.q1[s]);
          s++;
       }
       printf("\t");
       r++;p++;q++;
       s++;
     }
         else
     {
           while(pass1<match)
       {
           while(object.r1[r]!='\t')
          r++;
           while(object.q1[s]!='\t')
          s++;
          r++;
          s++;
       }
     }
          match++;
          pass1++;
         }
        }
      }
     getch();
}
 

It can also be the case that garbadge value is getting inseted, but i dont agree with it because when the loop which i have shown in bold starts executing then only value is increased so there must be some better reason ehich i don't know.
The remedyof it is to initialise the array when used as i have done with other members of MOT..,ill do that.
But i want to know the reason why itincreases so tremendously only in that loop and only with certain indices?
Whats the logic behind this??

[JosAH]

The following doesn't make sense:

 
  struct mot{ 
  char p1[80]; 
  char q1[40]; 
  int r1[]; 
   }object; 
   clrscr(); 
   object.r1[0]=1; 
   object.r1[1]=2; 
   object.r1[2]=3; 
   object.r1[3]=1; 
   object.r1[4]=2; 
   object.r1[5]=1; 
   object.r1[6]=2; 
 

Better make that array r1 an array of seven elements.

kind regards,

Jos

[Parul Bagadia]

@JosAH
But it should not affect its value in some loop where m not accessing it

[JosAH]

@Parul Bagadia
You already accessed it and corrupted your memory. Give that array a valid size.

kind regards,

Jos