#include <stdio.h>
main() 
{ 
char M[100];                                  
char C[100];
int K=5,i;
printf("please input character:\n");
gets(M); 

for(i=0;M[i]!='\0';i++)
 {
if(M[i]>='A'&& M[i]<='Z')
  C[i]=(M[i]-'A'+K)%26+'A';

  else
  C[i]=(M[i]-'a'+K)%26+'a';
 }
printf("result is:\n%s\n",C);
getch();

}