错误：标识符“cout”未定义。<iostream> 包含和使用命名空间 std；

Question

I am trying to cout some variables but the compiler says that cout is undefined . I have included iostream and am using namespace std. Removing using namespace std and using std::cout instead changes the issue to "namespace "std" has no member "cout" ". I found some answers saying to add # include "stdafx.h" to the code but Error: cannot open source file "stdafx.h" occurs.

Code is:

#include "Complex.h"
#include <cmath>
#include <iostream>

using namespace std;

Complex::Complex(int PolarOrRectang, float RealOrArg, float ImagOrAng) {
    if (PolarOrRectang == 0) {
        real = RealOrArg;
        imag = ImagOrAng;
    else {
        real = RealOrArg * cos(ImagOrAng);
        imag = RealOrArg * sin(ImagOrAng);
    }
};

void Complex::getValue(int PolarOrRectang) {
    if (PolarOrRectang == 0) {
        cout << real << " +_" << imag << "i" << endl;
    } else {
        cout << sqrt((real^2) + (imag^2)) << "*e^-" << atan(imag / real)<< endl;
    }
};

I'm trying to define a class, so my main is elsewhere. Running a very basic program that just couts "hello world" works fine, the problem is specific to this code.

Answer 1

Put #include<iostream> at the first position, the order is important

#include "Complex.h"
#include <iostream>
#include <cmath>

PS: Why do you use std:: when you are using "using namespace std;"?