#include <stdio.h>
main() 
{ 
char A[200];
char B[200];
int K=3,i;

printf("input character:\n");
gets(A);

for(i=0;A[i]!='\0';i++)
 if(A[i]>='!' && A[i]<='@')

     B[i]=(A[i]-'!'+K)%32+'!';

  else if(A[i]>='[' && A[i]<='`')

     B[i]=(A[i]-'['+K)%6+'[';

  else if(A[i]>='{' && A[i]<='~')

      B[i]=(A[i]-'{'+K)%4+'{';

printf("result is:\n%s\n",B);
getch();
}