阅读以下说明和C语言函数，将应填入 （n） 处的字句写在答题纸的对应栏内。
【说明】
函数change（int num）的功能是对四位以内（含四位）的十进制正整数num进行如下的变换：将num的每一位数字重复一次，并返回变换结果。例如，若nun = 5234，则函数的返回值为55223344，其变换过程可描述为：
（4*10+4）* 1 +（3*10+3）*100 + (2*10+2)*10000 + (5*10+5)*1000000 = 55223344
【C语言函数】
long change（int num）
{
int d， m = num;
long result，mul;
if（num ＜= 0 || （1） ） /*卡若num不大于0或num的位数大于4，则返回-1*/
return -1;
mul = 1;
（2） ;
while （m > 0） {
d = m % lO;
m = （3） ;
result = result + （ （4） ） * mul;
mul = （5） ;
}
return result;
}
正确答案及解析
正确答案
解析
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