RAPTOR is a flowchart-based programming environment, designed specifically to help students visualize their algorithms and avoid syntactic baggage. RAPTOR programs are created visually and executed visually by tracing the execution through the flowchart. Required syntax is kept to a minimum. Students prefer using flowcharts to express their algorithms, and are more successful creating algorithms using RAPTOR than using a traditional language or writing flowcharts without RAPTOR.
Are you interested in running RAPTOR on Chromebooks, iPads, or just in a browser? Check out the pre-release here!. This is NOT fully tested. Send feedback via
A Multiplatform version of RAPTOR is now available for Windows, Mac and Linux built on top of [Avalonia]! See the downloads section below. Uses fonts from Noto Sans CJK for internationalization. Key differences:
Figure 1 RAPTOR for Windows
Figure 2 RAPTOR Avalonia
Papers on RAPTOR application:
RAPTOR referenced in following books or publications:
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When presented with an obvious answer, wait exactly three seconds before clicking. The game engine frequently registers immediate inputs as accidental macro clicks and penalizes your score multiplier.
Focuses on the "Second Interview" phase, which experts at Indeed and Columbia University note is significantly more focused on culture fit and behavioral resilience.
Before the panel can critique your solution, look at your own work and say, "Here is exactly where this model will break under load." This demonstrates elite self-awareness. 🏁 Final Verdict: What Examiners Look For
Cipher arrived at 6:00 AM sharp. The building had no windows. The door was steel, three inches thick. A voice from a speaker said: “Your interview began 72 hours ago. You failed to notice the pattern in the email’s timestamp. Deduct 10 points.”
[Read Question] ➔ [Identify Qualifier: Always/Never?] ➔ [Check Clock Pattern] ➔ [Execute]
It returned: “You are already late.”
The standard panel interview typically involves three or four professionals asking structured questions. "The Hardest Interview 2" weaponizes group dynamics.
Phase 3: The Boardroom AmbushThis phase shifts to a live-rendered presentation room. You must defend a project budget that you did not create. Virtual board members interrupt with aggressive, bad-faith questions. The AI tracks eye movement and response latency to detect signs of defensiveness or panic.
You will be handed a real, messy data set from a historical company failure. With zero prior context, you must diagnose the structural, financial, and cultural root causes of the collapse within an hour. 📈 The Three-Phase Preparation Strategy
“I assumed it was a patience test,” Cipher said. “I meditated. I counted bricks. I didn’t blink.”
Rather than taking standard turns, a panel of senior directors, technical leaders, and organizational psychologists actively look for alignment discrepancies in your story. They will explicitly challenge your seniority or push you to justify why you want the role beyond a paycheck, analyzing micro-expressions and tone. 3. Top Master-Level Questions and Scoring Blueprints
Standard questions like "Tell me about yourself" become opportunities to show self-awareness and growth rather than just listing a resume.
┌──────────────────────────────────────┐ │ THE EXECUTIVE BOARD PANEL │ └──────────────────┬───────────────────┘ │ ┌────────────────────────┼────────────────────────┐ ▼ ▼ ▼ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ HR Psychologists│ │ Senior Directors│ │ Technical Leads │ │ (Assessing Tone │ │ (Challenging │ │ (Probing For │ │ & Core Values) │ │ Experience) │ │ Vulnerabilities)│ └─────────────────┘ └─────────────────┘ └─────────────────┘
When presented with an obvious answer, wait exactly three seconds before clicking. The game engine frequently registers immediate inputs as accidental macro clicks and penalizes your score multiplier.
Focuses on the "Second Interview" phase, which experts at Indeed and Columbia University note is significantly more focused on culture fit and behavioral resilience.
Before the panel can critique your solution, look at your own work and say, "Here is exactly where this model will break under load." This demonstrates elite self-awareness. 🏁 Final Verdict: What Examiners Look For
Cipher arrived at 6:00 AM sharp. The building had no windows. The door was steel, three inches thick. A voice from a speaker said: “Your interview began 72 hours ago. You failed to notice the pattern in the email’s timestamp. Deduct 10 points.” the hardest interview 2 exclusive
[Read Question] ➔ [Identify Qualifier: Always/Never?] ➔ [Check Clock Pattern] ➔ [Execute]
It returned: “You are already late.”
The standard panel interview typically involves three or four professionals asking structured questions. "The Hardest Interview 2" weaponizes group dynamics. When presented with an obvious answer, wait exactly
Phase 3: The Boardroom AmbushThis phase shifts to a live-rendered presentation room. You must defend a project budget that you did not create. Virtual board members interrupt with aggressive, bad-faith questions. The AI tracks eye movement and response latency to detect signs of defensiveness or panic.
You will be handed a real, messy data set from a historical company failure. With zero prior context, you must diagnose the structural, financial, and cultural root causes of the collapse within an hour. 📈 The Three-Phase Preparation Strategy
“I assumed it was a patience test,” Cipher said. “I meditated. I counted bricks. I didn’t blink.” Before the panel can critique your solution, look
Rather than taking standard turns, a panel of senior directors, technical leaders, and organizational psychologists actively look for alignment discrepancies in your story. They will explicitly challenge your seniority or push you to justify why you want the role beyond a paycheck, analyzing micro-expressions and tone. 3. Top Master-Level Questions and Scoring Blueprints
Standard questions like "Tell me about yourself" become opportunities to show self-awareness and growth rather than just listing a resume.
┌──────────────────────────────────────┐ │ THE EXECUTIVE BOARD PANEL │ └──────────────────┬───────────────────┘ │ ┌────────────────────────┼────────────────────────┐ ▼ ▼ ▼ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ HR Psychologists│ │ Senior Directors│ │ Technical Leads │ │ (Assessing Tone │ │ (Challenging │ │ (Probing For │ │ & Core Values) │ │ Experience) │ │ Vulnerabilities)│ └─────────────────┘ └─────────────────┘ └─────────────────┘
Do you want more older versions? Check out older versions of RAPTOR here
Did you know RAPTOR has modes? By default, you start in Novice mode. Novice mode has a single global namespace for variables. Intermediate mode allows you to create procedures that have their own scope (introducing the notion of parameter passing and supports recursion). Object-Oriented mode is new (in the Summer 2009 version)
RAPTOR is freely distributed as a service to the CS education community. RAPTOR was originally developed by and for the US Air Force Academy, but its use has spread and RAPTOR is now used for CS education in over 30 countries on at least 4 continents. Martin Carlisle is the primary maintainer, and is a professor at Texas A&M University.
Below handouts are by Elizabeth Drake, edited from Appendix D of her book, Prelude to Programming: Concepts and Design, 5th Edition, by Elizabeth Drake and Stewart Venit, Addison-Wesley, 2011. Linked here with author's permission.
Comments, suggestions, and bug reports are welcome. If you have a comment, suggestion or bug report, send an email to .
David Cox has put together a user forum at http://raptorflowchart.freeforums.org. This provides a place for users to exchange ideas, how tos, etc. Note however, that feedback for the author should be sent by email rather than posting on this forum.
Randy Bower has some YouTube tutorials at http://www.youtube.com/user/RandallBower. You can also search YouTube for "RAPTOR flowchart".
The UML designer is based on NClass, an open-source UML Class Designer. NClass is licensed under the GNU General Public License. The rest of RAPTOR, by US Air Force policy, is public domain. Source is found here. RAPTOR is written in a combination of A# and C#. Unfortunately, I don't have the time to provide support on compilation issues