Please write C++ code that implement discrete  Fourier transform

The problem is from Introduction to Programming and Data Structures with C++, 4th edition (Algebra: solve quadratic equations) The two roots of a quadratic equation ax2 + bx + c = 0 can be obtained using the following formula: r1=-b+√b2-4ac/2 and r2=-b-√b2-4ac/2 b2 – 4ac is called the discriminant of the quadratic equation. If it is positive, the equation has two real roots. If it is zero, the equation has one root. If it is negative, the equation has no real roots. Write a program that prompts the user to enter values for a, b, and c and displays the result based on the discriminant. If the discriminant is positive, display two roots. If the discriminant is 0, display one root. Otherwise, display “The equation has no real roots”.

Code in C++

What are the potential benefits of the C calling convention over the STDCALL calling convention?

work and write the cosine function's taylor expansion (N=10) in C++ and compare the <cmath> with your version (see nartual exponent EXP() vs exp()). EQUATION ATTACHED.    EXAMPLE: #include <iostream> #include <cmath> using namespace std; // lazy technique // Factorial Recursion. // https://en.wikipedia.org/wiki/Factorial // write the factorial function as a loop (iteration) // This might seem trivial, but people have researched this // this topic. Sterling series approximation // https://en.wikipedia.org/wiki/Stirling_approximation int fact(int N) { if (N == 0) return 1; else return N * fact(N - 1); } // taylor series approximation for the // natural exponent 2.718... which is abbreviated as exp. double EXP(double x) { double sum = 0.0; for (int i = 0; i < 10; i++) sum += pow(x, i) / fact(i); return sum; } // dummy--aka place holder--functions. double SIN(double x) { return 1; } double COS(double x) { return 0; } int main() { std::cout << "e-World!\n"; for…

Python

Write program to add, subsract two numbers a&b in c

What are the potential benefits of the C calling convention over the STDCALL calling convention?

Explain this c++ statement Std::vector v2(5, Point3D(1,2));

I've seen the second question of this answered, but I've yet to see 3a and 3b be answered. The code is done in c. Not c++.