To implement Hill- cipher encryption decryption in C. (WITH OUTPUT IMAGE)

#include<stdio.h>

#include<conio.h>

#include<string.h>

#include<iostream.h>

void main()

{

int i,j,key[5][5],ikey[5][5],row,col,plen,suc;

int devide,count,h,k,no,p1[100],e1[100],d1[100],m,pp[10],temp;

char p[100],e[100],d[100],clen,det;

clrscr();

printf("Enter your plaintext::::::::");

gets(p);

plen=strlen(p);

printf("\n HOW MANY SUCCESSIVE ELMENTS YOU WILL TAKE IN PLAINTEXT??");

scanf("%d",&suc);

row=suc;

col=suc;

printf("\n ENTER ELEMENTS OF KEY MATRIX (row by row)::::");

for(i=0;i<row;i++)

for(j=0;j<col;j++)

scanf("%d",&key[i][j]);

/*for(i=0;i<row;i++)

{printf("\n");

for(j=0;j<col;j++)

printf(" %d ",key[i][j]);

}

*/

devide=(plen+1)/suc;

count=0;

no=0;

for(h=0;h<devide;h++)

{

  for(i=0;i<suc;i++)

  { if(p[count]!='\0')

    {p1[i]=p[count]-97;

    count++;

    }

  }

  for(i=0;i<suc;i++)

  {   e1[no]=0;

      for(k=0;k<suc;k++)

      {e1[no]=e1[no]+(key[i][k]*p1[k]);

      }

      no++;

  }

}

printf("\n PLAIN TEXT::::::::::::::::::::::::::::");

puts(p);

printf("\n ENCRYPTED TEXT::::::::::::::::::::::::");

for(i=0;i<plen;i++)

{e[i]=(e1[i]%26)+97;

printf("%c",e[i]);

}

//decryption part;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

clen=strlen(e);

devide=(clen+1)/suc;

//start decryption:::::::::::::

printf("\n ENter inverse matrix values");

for(i=0;i<suc;i++)

for(j=0;j<suc;j++)

{scanf("%d",&ikey[i][j]);

}

count=0;

no=0;

for(h=0;h<devide;h++)

{

  for(i=0;i<suc;i++)

  { if(e[count]!='\0')

    {p1[i]=e[count]-97;

    count++;

    //printf("p %c",p1[i]);

    }

  }

  for(i=0;i<suc;i++)

  {   d1[no]=0;

      for(k=0;k<suc;k++)

      {d1[no]=d1[no]+(ikey[i][k]*p1[k]);

      }

      no++;

  }

}

printf("\n DECRYPTED TEXT::::::::::::::::::::::::");

for(i=0;i<plen;i++)

{d[i]=(d1[i]%26)+97;

printf("%c",d[i]);

}

getch();

}

OUTPUT: