foo.cc: In constructor 'Charstyle::Charstyle(char*)':
foo.cc:10:8: warning: statement has no effect [-Wunused-value]
   10 |   for (i; a[i] != 0; i++)
      |        ^
foo.cc: In copy constructor 'Charstyle::Charstyle(Charstyle&)':
foo.cc:17:8: warning: statement has no effect [-Wunused-value]
   17 |   for (i; s.data[i] != 0; i++)
      |        ^
foo.cc: In function 'int main()':
foo.cc:76:9: warning: left operand of comma operator has no effect [-Wunused-value]
   76 |    for (p, j; p <= r - 1; p++, j++)
      |         ^
foo.cc:76:13: warning: right operand of comma operator has no effect [-Wunused-value]
   76 |    for (p, j; p <= r - 1; p++, j++)
      |             ^
foo.cc:82:9: warning: left operand of comma operator has no effect [-Wunused-value]
   82 |    for (p, j; p <= r - 1; p++, j++)
      |         ^
foo.cc:82:13: warning: right operand of comma operator has no effect [-Wunused-value]
   82 |    for (p, j; p <= r - 1; p++, j++)
      |             ^

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