VC6.0环境 取十进制数所有奇数数字，用它们构成一个最小数  编译通过 输出有问题
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
long fun(long s)
{
    long d[15],n,i,j,g,temp;
    for(n=0;s!=0&&n<15;)
    {
        if(s%10%2)
            d[n++]=s%10;
        s/=10;
    }
    for(i=0;i<n-1;i++)
        for(j=i;j<n;j++)
         if(d[i]>d[j])
            {
                temp=d[i];
                d[i]=d[j];
                d[j]=temp;
            }
    for(j=0;j<n;j++)
    {
        i=d[n-j-1]*pow(10,j);
        g+=i;
    }
    return g;
}
void main()
{
    long s,d;
    FILE *fp;
    scanf("%ld",&s);
    d=fun(s);
    if((fp=fopen("myf2.out","w"))==NULL)
    {
        printf("can not open the file\n");
        exit(0);
    }
    fprintf(fp,"%ld\n",d);
    printf("%ld\n",d);
    fprintf(fp,"My exam number is : 1231231234\n");
    fclose(fp);
}

我的错在哪呢？