foo.cc: In function 'int main()':
foo.cc:6:12: warning: unused variable 'c' [-Wunused-variable]
    6 |  float a,b,c=0;
      |            ^
foo.cc:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  scanf("%f,%f,%c",&a,&b,&t);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务