为什么出现不了i he y xiangdeng 的结果

#include<stdio.h>
#include<math.h>
int main()
{
    float i,y;
    scanf("%f,%f",&i,&y);
    if(fabs(i-y)<=0.00001)
    printf("i he y xiangdeng\n");
    else
        printf("i he y buxiangdeng\n");
    return 0;
}