6. Simple Output¶

Learn how to display text and numbers in a simple way within your program. Simple display doesn't allow you to specify fonts, positions, or colors, but you can display strings and numbers on screen with minimal code.

6.1 Simple Display of Strings and Numbers¶

When you pass strings or numbers to Print using the << operator, they are displayed in a simple way at the top-left of the screen
When handling strings in Siv3D programs, add U before the double quotes
- This is the notation for treating strings as Unicode (UTF-32) strings

# include <Siv3D.hpp>

void Main()
{
	Print << U"C++";

	Print << U"Hello, " << U"Siv3D"; // Multiple parts are OK too

	Print << 123;

	Print << 4.567;

	while (System::Update())
	{

	}
}

6.2 Displaying Many Simple Outputs¶

Simple outputs remain on screen
When the screen can't fit any more, older outputs disappear in order

# include <Siv3D.hpp>

void Main()
{
	int32 count = 0;

	while (System::Update())
	{
		Print << count;

		++count;
	}
}

6.3 Clearing Simple Display¶

To clear all simple display from the screen, use ClearPrint()
If you always call ClearPrint() at the beginning of the main loop, you can display only the content output within the current frame

# include <Siv3D.hpp>

void Main()
{
	int32 count = 0;

	while (System::Update())
	{
		// Clear old outputs (outputs from previous frames)
		ClearPrint();

		Print << count;

		++count;
	}
}

Review Checklist¶

Learned to send values to Print with << to display strings and numbers in a simple way on screen
Learned to add U before double quotes when handling strings
Learned that outputs displayed with Print remain on screen
Learned to clear simple display with ClearPrint()