PROGRAM TO ENCRYPT GIVEN MESSAGE BY USING ROT 13

This Program will encrypt given word or sentence into ROT 13

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Coding

#include<conio.h>
#include<stdio.h>
#include<string.h>
main()
{
do
{
clrscr();
char ch[160];
int length;
printf("\t\tTHIS PROGRAM IS CODED BY SYED MUHAMMED TAQI\n\nVISIT MY blog techgulf.blogspot.com\n\nNOTE:\n1.Please type you word or sentence and press enter to encrypt you input\n\n2.Input is case sensitive");
printf("\n\nEnter your message : ");
gets(ch);
length=strlen(ch);
for(int a=0; a<length; a++)
{
if(ch[a]>=65 && ch[a]<=77)
    ch[a]=ch[a]+13;

else if (ch[a]>=78 && ch[a]<=90)
    ch[a]=ch[a]-13;

else if (ch[a]>=97 && ch[a]<=109)
    ch[a]=ch[a]+13;

else if (ch[a]>=110   && ch[a]<=122)
    ch[a]=ch[a]-13;
}
printf("\nYou meesage after encryption is\n\n");
for(a=0; a<length; a++)
printf("%c",ch[a]);
printf("\n\nDo you want to run this program again (y/n) ?");
}
while(getche()!='n');
printf("\n\nThank You for using the program");
getche();
}




Hope you like it :)