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Como somar valores de uma CheckListBox no C++Builder?



Sou iniciante em C++builder e preciso somar os valores de uma Checklistbox, mas estou com problema na hora da conversão dos valores. Meu código está assim:

void __fastcall TForm1::CorrigirClick(TObject *Sender)

  int x;
  float soma=0;

  for(x=0; cblOp->Items->Count-1; x++) {
     soma = soma + StrToFloat(cblOp->Items[x]);
   Edit1->Text = FloatToStr(soma);


O erro é o seguinte: [BCC32 Error] Unit1.cpp(50): E2285 Could not find a match for 'StrToFloat(TStrings)'

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