c语言第五章作业

/*P112的5.7题目*/

#include <stdio.h>

main()
{
    int A, B=0, a0, a1, a2, a3, a4;
    printf("请输入一个不多于5位的正整数：");
    scanf("%d", &A);
    if(a0 = A/10000)
    {    A %= 10000;
        B = 5;
    }
    if(a1 = A/1000)
    {    A %= 1000;
        B = B == 0 ? 4 : B;
    }
    if(a2 = A/100)
    {    A %= 100;
        B = B == 0 ? 3 : B;
    }
    if(a3 = A/10)
    {    A %= 10;
        B = B == 0 ? 2 : B;
    }
    if(a4 = A/1)
        B = B == 0 ? 1 : B;
    printf("你输入的是%d位数\n", B);
    if(B>=1)
        printf("个位数是%d", a4);
    if(B>=2)
        printf(", 十位数是%d", a3);
    if(B>=3)
        printf(", 百位数是%d", a2);
    if(B>=4)
        printf(", 千位数是%d", a1);
    if(B==5)
        printf(", 万位数是%d", a0);
    printf("\n原数的逆序输出为：");
    if(B>=1)
        printf("%d",a4);
    if(B>=2)
        printf("%d",a3);
    if(B>=3)
        printf("%d",a2);
    if(B>=4)
        printf("%d",a1);
    if(B==5)
        printf("%d",a0);
    printf("\n");
}