为什么输出的都是个位数？

#include <stdio.h>
#include <math.h>

int main() {
    int num, ge, shi, bai, qian, wan,wei;
    printf("请输入一个不多于5位的整数:");
    scanf("%d", &num);
    if (num > 9999)
        wei = 5;
    else if ("num>999")
        wei = 4;
    else if ("num>99")
        wei = 3;
    else if ("num>9")
        wei = 2;
    else
        wei = 1;
    ge = num % 10;
    shi= num %100/ 10;
    bai = num %1000/ 100;
    qian = num%10000 / 1000 ;
    wan = num / 10000 ;
    switch (wei) {
        case'5':printf("5位数\n");
                printf("正序：%d%d%d%d%d", wan, qian, bai, shi,ge);
            printf("反序：%d%d%d%d%d", ge, shi, bai, qian, wan);
            break;
        case'4':printf("4位数\n");
                printf("正序：%d%d%d%d", qian, bai, shi, ge);
            printf("反序：%d%d%d%d", ge, shi, bai, qian );
            break;
        case'3':printf("3位数\n");
                printf("正序：%d%d%d",  bai, shi, ge);
            printf("反序：%d%d%d", ge, shi, bai );
            break;
        case'2':printf("2位数\n");
                printf("正序：%d%d",shi, ge);
            printf("反序：%d%d", ge, shi );
            break;
        default:
            printf("1位数\n");
            printf("正序：%d", ge);
            printf("反序：%d", ge);
            break;
    }
    return 0;
}