萌新求问，运行的时候显示:出现了一个问题导致程序停止正常工作，求解

# include <stdio.h>
# include <math.h>
int main()
{
    int num,indiv,ten,hundred,thousand,ten_thousand,place;
                     //分别代表个位，十位，百位，千位，万位和位数
    printf("请输入一个整数(0~9999):");
    scanf("%d,&num");
    if (num>9999)
        place=5;
    else if(num>999)
place=4;
    else if(num>99)
        place=3;
    else if(num>9)
        place=2;
    else place=1;
    printf("位数:%d\n",place);
    printf("每位数字为：");
    ten_thousand=num/10000;
    thousand=(int)(num-ten_thousand*10000/1000);
    hundred=(int)(num-ten_thousand*10000-thousand*1000)/100;
    ten=(int)(num-ten_thousand*10000-thousand*1000-hundred*100)/10;
    indiv=(int)(num-ten_thousand*10000-thousand*1000-hundred*100-ten*10);
    switch(place)
    {case 5:printf("%d,%d,%d,%d,%d",ten_thousand,thousand,hundred,ten,indiv);
    printf("\n反序数字为:");
    printf("%d%d%d%d%d\n",indiv,ten,hundred,thousand,ten_thousand);
    break;
   
    case 4:printf("%d,%d,%d,%d",thousand,hundred,ten,indiv);
    printf("\n反序数字为:");
    printf("%d%d%d%d\n",indiv,ten,hundred,thousand);
    break;
   
    case 3:printf("%d,%d,%d",hundred,ten,indiv);
    printf("\n反序数字为:");
    printf("%d%d%d\n",indiv,ten,hundred);
    break;
   
    case 2:printf("%d,%d",ten,indiv);
    printf("\n反序数字为:");
    printf("%d%d\n",indiv,ten);
    break;
   
    case 1:printf("%d",indiv);
    printf("\n反序数字为:");
    printf("%d%\n",indiv);
    break;
    }
    return 0;