Program 235:Decryption of Polybius Square Cipher using C

Program 235: Polybius Square in detail

#include<stdio.h>
#include<stdlib.h>
int main()
{
 int i,j,poly[26],x,k,num;
 printf("Enter how many numbers are there?\n");
 scanf("%d",&num);
 int numcipher[num];
 printf("Enter numbers separated by space\n");
 for(i=0;i<num;i++)
 {
  scanf("%d",&numcipher[i]);
 }

 x=0;
 k=11;
 //Assigning Polybius Square numbers to alphabets
 
for(i=0;i<=25;i++)
{
 if(i<=8)
 {
      if(i%5==0&&i!=0)
   {
  k+=5;
  poly[k]=x;
  k++;
 
    }
   else{
   poly[k]=x;
  k++;
  
      }
 }
 if(i>=10)
 {
      if(i%5==0&&i!=0)
   {
 
   poly[k]=x;
  k++;
   k+=5;
 
    }
   else{
 poly[k]=x;
  k++;
  
      }  
 }
 if(i==9)
 {
  poly[24]=8;//taking 'i' instead of 'j'
 }
 
  
  x++;
}
printf("Decrypted Code using Polybius Square Cipher \n");
for(i=0;i<num;i++)
{
 printf("%c",(poly[numcipher[i]]+65));
}
  printf("\n");
 return 0;
}

Explanation:

Polybius Square :

 Means A-11, F-21,N-33 and so on.

//Coming Soon

Output: