我在学习C++我从教科书上复制了这段代码,在编译代码时,最后出现错误。错误说:
控制到达非 void 函数的末尾
它位于代码的末尾:
#include "ComplexNumber.hpp"
#include <cmath>
ComplexNumber::ComplexNumber()
{
mRealPart = 0.0;
mImaginaryPart = 0.0;
}
ComplexNumber::ComplexNumber(double x, double y)
{
mRealPart = x;
mImaginaryPart = y;
}
double ComplexNumber::CalculateModulus() const
{
return sqrt(mRealPart*mRealPart+
mImaginaryPart*mImaginaryPart);
}
double ComplexNumber::CalculateArgument() const
{
return atan2(mImaginaryPart, mRealPart);
}
ComplexNumber ComplexNumber::CalculatePower(double n) const
{
double modulus = CalculateModulus();
double argument = CalculateArgument();
double mod_of_result = pow(modulus, n);
double arg_of_result = argument*n;
double real_part = mod_of_result*cos(arg_of_result);
double imag_part = mod_of_result*sin(arg_of_result);
ComplexNumber z(real_part, imag_part);
return z;
}
ComplexNumber& ComplexNumber::operator=(const ComplexNumber& z)
{
mRealPart = z.mRealPart;
mImaginaryPart = z.mImaginaryPart;
return *this;
}
ComplexNumber ComplexNumber::operator-() const
{
ComplexNumber w;
w.mRealPart = -mRealPart;
w.mImaginaryPart = -mImaginaryPart;
return w;
}
ComplexNumber ComplexNumber::operator+(const ComplexNumber& z) const
{
ComplexNumber w;
w.mRealPart = mRealPart + z.mRealPart;
w.mImaginaryPart = mImaginaryPart + z.mImaginaryPart;
return w;
}
std::ostream& operator<<(std::ostream& output,
const ComplexNumber& z)
{
output << "(" << z.mRealPart << " ";
if (z.mImaginaryPart >= 0.0)
{
output << " + " << z.mImaginaryPart << "i)";
}
else
{
output << "- " << -z.mImaginaryPart << "i)";
}
} //-------->>>>**"Control Reaches end of non-void function"**
Well operator<<
被定义为返回std::ostream&
:
std::ostream& operator<<(std::ostream& output, const ComplexNumber& z)
^^^^^^^^^^^^^
但你没有 return 语句,这是未定义的行为并且意味着你不能依赖程序的行为,结果是不可预测的。看起来你应该有:
return output ;
在函数的末尾。我们可以从 C++ 标准草案部分看到这是未定义的行为6.6.3
return 声明第 2 段内容如下:
[...] 从函数末尾流出相当于没有值的返回;这会导致返回值函数中出现未定义的行为。 [...]
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