如何将变量从一个函数转换为另一个函数？

Question

就像标题所说的一样，如何将我的discr变量从discr函数转换为calcRoots函数？

// 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

您没有提到语言，但我想是C ++。 在calcRoots内部，您可以调用discr并将值获取为这样的变量：

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

然后使用变量中的值存储。 希望能有所帮助。