C Program Replace Character with an Equivalent Encoded Character

#include <stdio.h> 
 void main( ) 
 { 
     char line [80] ; 
     int  count ; /* read i n the e n t i r e s t r i n g */ 
     printf ("Enter  a  line  of  text  below:\n"); 
     scanf ( "%s\ n",line ) ; 
     for (count = 0; line[count] != '\0' ; ++count) 
     { 
             if (((line[count] >= '0')&& (line[count] < '9')) || ((line[count] >= 'A') && (line[count] <'Z' ) ) || ((line[count] >= 'a') && (line[count] < 'z'))) 
               putchar(line[count] + 1); 
        else if (line[count] == '9' ) putchar('0'); 
        else if (line[count] == 'Z' ) putchar('A'); 
        else if (line[count] == 'z' ) putchar('a'); 
        else putchar('.'); 
     } 
 }