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  1. #include<stdio.h>
  2. #include<string.h>
  3. #include<ctype.h>
  4. int removerepeated(int size,int a[]);
  5. int insertelementat(int position,int a[],int size);
  6. void main()
  7. {
  8.  int i,j,k,numstr[100],numcipher[100],numkey[100],lenkey,templen,tempkey[100],flag=-1,size,cipherkey[5][5],lennumstr,row1,row2,col1,col2;
  9.  char str[100],key[100];
  10.  printf("Enter a string\n");
  11.  gets(str);
  12.  //converting entered string to Capital letters
  13.  for(i=0,j=0;i<strlen(str);i++)
  14.  {
  15.   if(str[i]!=' ')
  16.   {
  17.    str[j]=toupper(str[i]);
  18.    j++;
  19.   }
  20.  
  21.  }
  22.  str[j]='\0';
  23. printf("Entered String is %s\n",str);
  24.  //Storing string in terms of ascii and to restore spaces I used -20
  25.  size=strlen(str);
  26.  for(i=0;i<size;i++)
  27.  {
  28.   if(str[i]!=' ')
  29.   numstr[i]=str[i]-'A';
  30.  }
  31.  lennumstr=i;
  32.  //Key processing
  33.  
  34.  printf("Enter the key (Non repeated elements if possible)\n");
  35.  gets(key);
  36.  //converting entered key to Capital letters
  37.  for(i=0,j=0;i<strlen(key);i++)
  38.  {
  39.   if(key[i]!=' ')
  40.   {
  41.    key[j]=toupper(key[i]);
  42.    j++;
  43.   }
  44.  }
  45.  key[j]='\0';
  46.  printf("%s\n",key);
  47.  //Storing key in terms of ascii
  48.  k=0;
  49.  for(i=0;i<strlen(key)+26;i++)
  50.  {
  51.   if(i<strlen(key))
  52.   {
  53.    if(key[i]=='J')
  54.    {
  55.     flag=8;
  56.     printf("%d",flag);
  57.    }
  58.        numkey[i]=key[i]-'A';
  59.   }
  60.   else
  61.   {
  62.     if(k!=9 && k!=flag)//Considering I=J and taking I in place of J except when J is there in key ignoring I
  63.     {
  64. 	    numkey[i]=k;
  65.       }
  66.       k++;
  67.  
  68.   }
  69.  }
  70.  templen=i;
  71.  lenkey=removerepeated(templen,numkey);
  72.  printf("Entered key converted according to Play Fair Cipher rule\n");
  73.  for(i=0;i<lenkey;i++)
  74.  {
  75.      printf("%c",numkey[i]+'A');
  76.  }
  77.  printf("\n");
  78.  //Arranging the key in 5x5 grid
  79.  k=0;
  80.  for(i=0;i<5;i++)
  81.  {
  82.   for(j=0;j<5;j++)
  83.   {
  84.    cipherkey[i][j]=numkey[k];
  85.    k++;
  86.   }
  87.  }
  88.  
  89.  printf("Arranged key\n");
  90.  for(i=0;i<5;i++)
  91.  {
  92.   for(j=0;j<5;j++)
  93.   {
  94.  
  95.    printf("%c ",cipherkey[i][j]+'A');
  96.  
  97.   }
  98.   printf("\n");
  99.  }
  100.  
  101.    //Message Processing
  102.  
  103.    for(i=0;i<lennumstr;i+=2)
  104.    {
  105.       if(numstr[i]==numstr[i+1])
  106.       {
  107.        insertelementat(i+1,numstr,lennumstr);
  108.        lennumstr++;
  109.       }
  110.    }
  111.    if(lennumstr%2!=0)
  112.    {
  113.     insertelementat(lennumstr,numstr,lennumstr);
  114.     lennumstr++;
  115.    }
  116.    printf("Entered String/Message After Processing according to Play fair cipher rule\n");
  117.    for(i=0;i<lennumstr;i++)
  118.    {
  119.     printf("%c",numstr[i]+'A');
  120.    }
  121.    for(k=0;k<lennumstr;k+=2)
  122.    {
  123.     for(i=0;i<5;i++)
  124.     {
  125.      for(j=0;j<5;j++)
  126.      {
  127.       if(numstr[k]==cipherkey[i][j])
  128.       {
  129. 	 row1=i;
  130. 	 col1=j;
  131.       }
  132.       if(numstr[k+1]==cipherkey[i][j])
  133.       {
  134. 	 row2=i;
  135. 	 col2=j;
  136.       }
  137.  
  138.      }
  139.     }
  140.     if(row1==row2)
  141.     {
  142.      col1=(col1+1)%5;
  143.      col2=(col2+1)%5;
  144.      numcipher[k]=cipherkey[row1][col1];
  145.      numcipher[k+1]=cipherkey[row2][col2];
  146.     }
  147.     if(col1==col2)
  148.     {
  149.      row1=(row1+1)%5;
  150.      row2=(row2+1)%5;
  151.      numcipher[k]=cipherkey[row1][col1];
  152.      numcipher[k+1]=cipherkey[row2][col2];
  153.     }
  154.     if(row1!=row2&&col1!=col2)
  155.     {
  156.      numcipher[k]=cipherkey[row1][col2];
  157.      numcipher[k+1]=cipherkey[row2][col1];
  158.     }
  159.    }
  160.    printf("\nCipher Text is\n");
  161.  
  162.    for(i=0;i<lennumstr;i++)
  163.    {
  164.       printf("%c",numcipher[i]+'A');
  165.    }
  166.    printf("\n");
  167.  
  168.  
  169. }
  170.  
  171. int removerepeated(int size,int a[])
  172. {
  173.  int i,j,k;
  174.  for(i=0;i<size;i++)
  175.   {
  176.  for(j=i+1;j<size;)
  177.  {
  178.     if(a[i]==a[j])
  179.     {
  180.  
  181.      for(k=j;k<size;k++)
  182.      {
  183.       a[k]=a[k+1];
  184.      }
  185. 	 size--;
  186. 	}
  187.     else
  188.     {
  189.       j++;
  190.      }
  191.  }
  192.  }
  193. return(size);
  194. }
  195.  
  196. int insertelementat(int position,int a[],int size)
  197. {
  198.        int i,insitem=23;
  199.        int temp[size+1];
  200.     for(i=0;i<=size;i++)
  201. 	{
  202. 	if(i<position)
  203. 	{
  204. 	    temp[i]=a[i];
  205. 	}
  206. 	if(i>position)
  207. 	{
  208. 	 temp[i]=a[i-1];
  209. 	}
  210. 	if(i==position)
  211. 	{
  212. 	    temp[i]=insitem;
  213. 	}
  214.  
  215. 	}
  216.  
  217. 	for(i=0;i<=size;i++)
  218. 	{
  219. 	 a[i]=temp[i];
  220. 	 }
  221.  return(size);
  222. }
Runtime error #stdin #stdout #stderr 0s 4552KB
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Standard input is empty
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Standard output is empty
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./prog.sh: line 4: syntax error near unexpected token `('
./prog.sh: line 4: `int removerepeated(int size,int a[]);'
https://ideone.com/WGkp4I
language:
Bash (bash 5.0.3)
created:
4 years ago
visibility:
public

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