First R program in R Programming - Step-by-Step Execution

Concept Flow - First R program

Start R script

↓

Run cat("Hello, world!")

↓

Display output on console

↓

End program

The program starts, runs the cat command to show text, then ends.

Execution Sample

R Programming

cat("Hello, world!")

This code prints the text Hello, world! to the console.

Execution Table

Step	Action	Code Evaluated	Output
1	Execute cat function	cat("Hello, world!")	Hello, world!
2	Program ends	No more code	No output

💡 No more code to run, program ends.

Variable Tracker

Variable	Start	After Step 1	Final
No variables	N/A	N/A	N/A

Key Moments - 2 Insights

Why do we use cat() in R to show text?

cat() tells R to display the text on the screen cleanly, as shown in step 1 of the execution_table.

Does the program store the text in a variable?

No, this simple program just prints text directly without storing it, so variable_tracker shows no variables.

Visual Quiz - 3 Questions

Look at the execution_table, what is printed at step 1?

A Hello, world!

B cat("Hello, world!")

C No output

D Program ends

💡 Hint

Check the Output column in execution_table row 1.

At which step does the program finish running?

A Step 1

B Before Step 1

C Step 2

D Never ends

💡 Hint

Look at the Action column in execution_table row 2.

If we remove cat(), what happens to the output?

A No output is shown

B Text still prints

C Error occurs

D Program runs twice

💡 Hint

R evaluates string literals and prints them (with [1] formatting), so text still prints.

Concept Snapshot

cat("text")
- Shows text on the console
- Runs code line by line
- No variables needed
- Program ends after last line

Full Transcript

This simple R program uses cat() to show the text Hello, world! on the screen. The program starts, runs the cat command, then ends. There are no variables used. The output appears on the console after running cat().