输出不了等腰直角三角形

Question

为什么输出不了等腰直角三角形，有什么修改方法吗？

#include<stdio.h>
#include<math.h>
#define EPS 1e-6
int main(void)
{
    float a, b, c;
    int flag = 1;
    printf("Input a,b,c:");
    scanf_s("%f,%f,%f", &a, &b, &c);
    if (a + b > c && b + c > a && a + c > b)
    {
        if (fabs(a - b) <= EPS && fabs(b - c) <= EPS && fabs(c - a) <= EPS)
        {
            printf("等边");
            flag = 0;
        }
        else if (fabs(a - b) <= EPS || fabs(b - c) <= EPS || fabs(c - a) <= EPS)
        {
            printf("等腰");
            flag = 0;
        }
        if (fabs(a * a + b * b - c * c) <= EPS || fabs(b * b + c * c - a * a) <= EPS || fabs(a * a + c * c - b * b) <= EPS)
        {
            printf("直角");
            flag = 0;
        }
        if (flag)
        {
            printf("一般");
        }
        printf("三角形\n");
    }
    else
    {
        printf("不是三角形\n");
    }
    return 0;
}

Answer 1