foo.cc: In function 'int main()':
foo.cc:6:28: warning: unused variable 'm1' [-Wunused-variable]
  int m[5],m_c=0,f[5],f_c=0,m1[5],f1[5],c;
                            ^~
foo.cc:6:34: warning: unused variable 'f1' [-Wunused-variable]
  int m[5],m_c=0,f[5],f_c=0,m1[5],f1[5],c;
                                  ^~

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