foo.cc: In function 'int main()':
foo.cc:5:8: warning: unused variable 'a' [-Wunused-variable]
    5 |  float a,x,y,z,b,c,d,e,f;
      |        ^
foo.cc:5:22: warning: unused variable 'e' [-Wunused-variable]
    5 |  float a,x,y,z,b,c,d,e,f;
      |                      ^
foo.cc:5:24: warning: unused variable 'f' [-Wunused-variable]
    5 |  float a,x,y,z,b,c,d,e,f;
      |                        ^

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