(IS2) Write a Program to implement-MODIFIED CEASER CIPHER

#include<stdio.h>

#include<conio.h>

void main()

{

            int i,no,c;

            char om[30],em[30];

            clrscr();

            printf("Enter Original Text: ");

            gets(om);

            printf("Enter Key No: ");

            scanf("%d",&no);

            c=no/26;

            if(no>26)

                        no=no-(c*26);

            for(i=0;om[i]!=NULL;i++)

            {

                        if(om[i]==' ')

                        {

                                    em[i]=' ';

                        }

                        else if(om[i]>='a' && om[i]<='z')

                        {

                                    em[i]=om[i]+no;

                                    if(em[i]>'z' || em[i]<0)

                                    {

                                                em[i]=em[i]-26;

                                    }

                        }

                        else

                        {

                                    em[i]=om[i]+no;

                                    if(em[i]>'Z')

                                    {

                                                em[i]=em[i]-26;

                                    }

                        }

            }

            em[i]=NULL;

            printf("\n Your Original Text = %s ",om);

            printf("\n Enter Encrypted Text = %s ",em);

            getch();

}

OUTPUT: