如何从一个函数到另一个函数获取变量？

Question

正如标题所说，我如何从我的discrimin函数中将我的光盘变量放入我的calcRoots函数中？

// Function calculating roots
bool calcRoots(double coeffs[], int coeffLength, double roots[], int rootLength) {
   if(disc >= 0) {
      roots[rootLength - 1] = ((-(coeffs[coeffLength - 2]) + sqrt(disc)) / (2*(coeffs[coeffLength - coeffLength])));
      roots[rootLength - rootLength] = ((-(coeffs[coeffLength - 2]) - sqrt(disc)) / (2*(coeffs[coeffLength - coeffLength])));
      return true;
   }
   else {
      return false;
   }
}

// Solves the discriminant
double discr(double coeffs[], int coeffLength){
   double disc = (pow(coeffs[coeffLength - 2],2)-4*coeffs[coeffLength - coeffLength]*coeffs[coeffLength - 1]);
   return disc;
}

Answer 1

你没有提到nay语言，但我认为是C ++。 在calcRoots中，您可以调用discrimin并将值赋给变量，如下所示：

double disc = discr(coeffs[], coeffLength);

然后在变量中使用值存储。希望这有帮助。