C语言编程，函数问题，简单！！！

# include <stdio.h>
void main ()
{
int m,a[10],i=0,n,j,k,t,s=0;
printf("请输入正整数:");
scanf("%d",&m);
do
{
a[i]=m%10;
m=m/10;
i++;
s++;
}
while(m!=0);

for(i=0;i<s;i++)
{
k=i;
for(j=i+1;j<s;j++)
if(a[j]<a[k])
k=j;
if(k!=i)
{t=a[k];a[k]=a[i];a[i]=t;}
}
for(i=0;i<s;i++)
printf("%d ",a[i]);
}

#include <stdio.h>
#include<stdlib.h>

main()
{
int number;

printf("The number is 123\n");
for(number=123;number%10!=0;number=number/10)
printf("%d\t",number%10);

system("pause");
}

#include<stdio.h>
#define N 10
void fenjie(long n)
{
int i,p[N];
for(i=0;n!=0;i+