misaka oj 1003 大数加法

http://oj.misakamm.com/JudgeOnline/problem.php?id=1003

#include <fstream>

int main()
{
    char bufa[1001] , bufb[1001] ;
    scanf( "%s%s" , bufa , bufb ) ;
    int h , i = 0 , j = 0 , k , a[1001] , b[1001] , c[1001] ;
    bool onoff ;

    for ( h = 0 ; bufa[h] ; ++h ) ;
    while ( h > 0 ) a[++i] = bufa[--h] - '0' ;

    for ( h = 0 ; bufb[h] ; ++h ) ;
    while ( h > 0 ) b[++j] = bufb[--h] - '0' ;

    if ( i > j ) while ( j < i ) b[++j] = 0 ;
    else while ( i < j ) a[++i] = 0 ;

    c[1] = 0 ;
    for ( h = 1 ; h <= i ; ++h )
    {
        c[h] += a[h] + b[h] ;
        c[h+1] = c[h] / 10 ;
        c[h] %= 10 ;
    }
    if ( c[h] == 0 ) --h ;

    while ( h > 0 ) printf( "%d" , c[h--]) ;
}