Thread: Just learning C++ and am having trouble

Hey everyone, this is my first time learning a language (apart from HTML and CSS) and I am having a few problems. I have read the first few parts of the tutorial on this site, and I decided to create a basic program that multiplies two numbers that the user types in.

I am having a problem with outputting text. Here's the code

Code:

#include <iostream>

using namespace std;

int main()
{

 float number1, number2, a;

 cout<<"Please enter a number: ";
 cin>> number1;
 cin.ignore();
 cout<<"What number would you like to multiply " << number1 << " by: ";
 cin>>number2;
 cin.ignore();
 cout<< "" <<number1<< " multiplied by " << number2 << "equals" (number1 * number2);
 cin.get();

 return 1;
}

According to my compiler, Dev-C++, I cannot use "equals" as a function, although I just want this text to be displayed on the screen.

What is it I'm doing wrong?

Code:

cout<< "" <<number1<< " multiplied by " << number2 << "equals" (number1 * number2);

treat (number1 * number2) using the same technique as you did with your other variables, number1 and number2

a simpler easier way would be something like this;

Code:

float Number1, Number2;

cout << "First Number : ";

cin >> Number1;

cout << "To be multiplied by : ";

cin >> Number2;

cout << Number1 << " x " << Number2 << " = " << Number1 * Number2 << endl;

Originally Posted by goldz

Code:

cout<< "" <<number1<< " multiplied by " << number2 << "equals" (number1 * number2);

treat (number1 * number2) using the same technique as you did with your other variables, number1 and number2

The thing is, (number1 * number2) still outputs the correct product of number1 and number2, but the thing is my compiler wont let me have the word "equals" in between <<number2<< and (number1 * number2). I just need to know how to have the word "equals" display properly.

you forgot the '<<' at the end.

edit: in between the "equals" << ( etc) << endl;

what is endl?

Originally Posted by Timbo8

what is endl?

just the end of the line, it makes sure that anything else displayed goes on a new line.

edit: you dont really need it on the end one though, but you do need the extra <<'s

thanks for your help i have it working now. I dont need the ( and ) around the number1 * number2, but i needed << and <<, but i also need \n, which also puts the next text ona new line. So the final code is

Code:

#include <iostream>

using namespace std;

int main()
{

 float number1, number2;

 cout<<"Please enter a number: ";
 cin>> number1;
 cin.ignore();
 cout<<"What number would you like to multiply " << number1 << " by: ";
 cin>> number2;
 cin.ignore();
 cout<< "" <<number1<< " multiplied by " << number2 << " equals " << number1 * number2 << "\n";
 cin.get();

 return 1;
}

endl is a manipulator for output streams (like cout, or an instance of ofstream). it outputs the newline character - '\n' and then flushes the stream.

so at the end do i put endl or \n, or both?

Either endl or '\n' are perfectly fine. I think most of the time endl is just used to add clarity to the code (since there's rarely a case that I can think of when 'cout' needs flushing)