c++ Simple Program - How to return an array from a function -


this question has answer here:

i learning c++ @ school , have simple home work do. got working in more simple way wanted try implement calculation through function. returning 3 different values thought of returning array , output values later on main.

i getting lot of strange errors like:

std::cin not element std , lib cmath not being incorporated. have been doing research did not find help.

#include "iostream" #include "cmath"   double r;  double* calcspheremesures(double r);  double* calcspheremesures(double r) {     const double pi = 3.1416;     double d, area, circumference, volume;     double results[3];      d = 2*r;     circumference = pi * d;     area = (4 * pi * pow(r,2));     volume = (4 * pi * pow(r,3))/3;      results[0] = area;     results[1] = circumference;     results[2] = volume;      return results;

}

int main() {      std::cout << "please enter radius of circle: ";     std::cin >> r;      double* results = calcspheremesures(r);      std::cout << "************************************" << "\n"     << "*area , circumference of sphere*" << "\n"     << "************************************" << "\n"     << "area" << results[0]<< "\n"     << "circumference" << results[1]<< "\n"     << "volume" << results[2];      return 0; }

is syntax error or did wrong pointers? saw 1 of solutions problem returning array use pointers not return c type array in c++.

the code working , these strange errors coming visual studio. 

#include "stdafx.h" #include "iostream"  #include <cmath>   double r; double *calcspheremesures(double r);  double *calcspheremesures(double r) {     const double pi = 3.1416;     double d, area, circumference, volume;     double results[4];      d = 2*r;     circumference = pi * d;     area = (4 * pi * pow(r,2));     volume = (4 * pi * pow(r,3))/3;      results[0] = area;     results[1] = circumference;     results[2] = volume;     results[3] = d;     return results; }  int main() {      std::cout << "please enter radius of circle: ";     std::cin >> r;     double *results = calcspheremesures(r);      std::cout << "\n**************************************" << "\n"     << "* area , circumference of sphere *" << "\n"     << "**************************************" << "\n"     << "\nradius: " << r << "\n"     << "diameter: " << results[3] << "\n"     << "area: " << results[0] << "\n"     << "circumference: " << results[1] << "\n"     << "volume: " << results[2];     return 0; }


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