Weird hexadecimal answers to simple math in code::blocks

Question

I'm trying to do the following assignment in a c++ book.

After running this:

#include <iostream>

using namespace std;

int main()
{
double first_arg;
double second_arg;

cout << "Enter first argument: ";
cin >> first_arg;
cout << "Enter second argument: ";
cin >> second_arg;

cout << first_arg << " * " << second_arg <<  " = "
     << cout << first_arg * second_arg << "\n";

cout << first_arg << " + " << second_arg << " = "
     << cout << first_arg + second_arg << "\n";

cout << first_arg << " / " << second_arg << " = "
     << cout << first_arg / second_arg << "\n";

cout << first_arg << " - " << second_arg << " = "
     << cout << first_arg - second_arg << "\n";

I get some unexpected results. Like this result copied straight from the windows cli:

Enter first argument: 7
Enter second argument: 9
7 * 9 = 0x6fcc43c463
7 + 9 = 0x6fcc43c416
7 / 9 = 0x6fcc43c40
7 - 9 = 0x6fcc43c4-2

I'm using the latest version of codeblocks with the default compiler settings. Thanks.

Answer 1

cout << first_arg << " * " << second_arg <<  " = "
     << cout << first_arg * second_arg << "\n";

You have two cout in one line since there is no semicolon on line 1

To fix this either get rid of the second cout or add a semicolon at the end of the first line on each cout statement.

If you look at the last 2 digits of each answer you will see the answer you wish to get so its still printing out the answer you want its just after the pointer to cout.