#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:
