出于某种原因，布尔值返回 false

Bool value returning false for some reason

本文关键字：返回 false 布尔值 某种原因      更新时间：2023-10-16

抱歉，如果这很明显，但我对 c++ 很陌生，提前谢谢

#include <iostream>
bool conduct_it_support(bool on_off_attempt) {
  std::cout << "Have you tried turning it off and on again? (true / false)n";
  std::cin >> on_off_attempt;
  if(on_off_attempt == false) {
    return false;
  }
  else {
    return true;
  }
  return on_off_attempt;
}
int main() {
  bool attempt;
  conduct_it_support(attempt); {
    std::cout << "so it was " << attempt << "?n";
  }

}

我的意思是

："所以这是真的/假的？抱歉，如果这很明显，但我对 c++ 很陌生，提前谢谢

默认情况类会将bool序列化为 0 或 1 。反序列化时，它们还将读取0或1。

若要使其打印字符串true或false，需要使用流修饰符std::boolalpha来更改流的行为，以打印(或读取(布尔值的文本版本。

见下文：

#include <iostream>
#include <iomanip>
int main ()
{
  bool a = false;
  bool b = true;
  std::cout << std::boolalpha   << a << " : " << b << 'n';
  std::cout << std::noboolalpha << a << " : " << b << 'n';

  // If you want to read a bool as 0 or 1
  bool check;
  if (std::cin >> std::noboolalpha >> check) {
      std::cout << "Read Worked: Got: " << check << "n";
  }
  else
  {
      std::cout << "Read Failedn";
  }
  // PS. If the above read failed.
  //     The next read will also fail as the stream is in a bad
  //     state. So make the above test work before using this code.

  // If you want to read a bool as true or false
  bool check;
  if (std::cin >> std::boolalpha >> check) {
      std::cout << "Read Worked: Got: " << check << "n";
  }
  else
  {
      std::cout << "Read Failedn";
  }
}

这段代码工作正常： 

bool conduct_it_support(bool init) {
  bool on_off_attempt=init;
  char selectVal[10] = "000000000";
  std::cout << "Have you tried turning it off and on again? (true / false)n";
  std::cin >> selectVal;
  if(selectVal == "false") {
    on_off_attempt=false;
  }
  else {
    on_off_attempt=true;
  }
  return on_off_attempt;
}
int main()
{
    bool attempt;
    attempt = conduct_it_support(attempt); {
    std::cout << "so it was " << attempt << "?n";
    }

在此处尝试此代码。

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