/* ----------------------------------------------------------------------------  
//  Figure 7.17: Number conversion.
//  Convert an integer to a selected base and print using place-value notation.             
// ---------------------------------------------------------------------------- 
*/
#include "tools.h"

void main( void )                                                              
{ 
    long n;         /* input: the number to convert */  
    short base;     /* input: base to which we will convert n */
    short rhdigit;  /* right-hand digit of n-prime */
    int power;      /* loop counter */

    banner();
    printf( " Read an integer and express in a given base.\n" 
            " Please enter a base between 2 and 10: " );
    scanf( "%hi", &base );
    if (base < 2 || base > 10) fatal( " Base is not in required range." );

    printf( " Enter the number to convert: " );
    scanf( "%li", &n );
    if (n < 1) fatal( " Number must be greater than 0." );
    
    /* ------------ Generate digits of converted number, right to left. */ 
    for (power = 0; n != 0; ++power) {
        if (power == 0) {
            printf( "\n%12li =  ", n);
        }
        else {
            printf( "             +  ");
        }
    
        rhdigit = n % base;         /* Isolate right-hand digit of n.   */
        n /= base;                  /* then eliminate right-hand digit. */

        printf( "%2hi * %hi^%i \n", rhdigit, base, power ); 
    }
    bye();
 }