数字排序，由小到大输出

#include <iostream>
#include <string.h>
using namespace std;
int main()
{
    char a[100];
    int i,j,n,temp;
    cout<<"input numbers:"<<endl;
    gets(a);
    n=strlen(a); 
    for(j=0;j<n-1;j++)
        for(i=0;i<n-j-1;i++)
            if(a[i]>a[i+1])
                {
                    temp=a[i];
                    a[i]=a[i+1];
                    a[i+1]=temp;
                }
    cout<<"from small to large output the numbers :"<<endl;
    for(i=0;i<n;i++)
    cout<<a[i]<<" ";
    
    return 0;
 }