Adding and updating values in Go - Step-by-Step Execution

Concept Flow - Adding and updating values

Start

↓

Create variable

↓

Add value

↓

Update value

↓

Use or print value

↓

End

This flow shows how a variable is created, then a value is added or updated, and finally used or printed.

Execution Sample

Go

package main
import "fmt"
func main() {
  x := 10
  x = x + 5
  fmt.Println(x)
}

This Go program creates a variable x, adds 5 to it, updates x, and prints the result.

Execution Table

Step	Action	Variable x	Output
1	Declare x with 10	10
2	Add 5 to x and update	15
3	Print x	15	15

💡 Program ends after printing the updated value of x.

Variable Tracker

Variable	Start	After Add	Final
x	10	15	15

Key Moments - 2 Insights

Why does x change from 10 to 15 after adding 5?

Because the statement x = x + 5 takes the current value of x (10), adds 5, and stores the new value (15) back into x, as shown in step 2 of the execution table.

Does the original value of x (10) stay the same after updating?

No, the original value is replaced by the new value 15. The variable x holds only one value at a time, updated in step 2.

Visual Quiz - 3 Questions

Look at the execution table, what is the value of x after step 2?

A 5

B 15

C 10

D 0

💡 Hint

Check the 'Variable x' column at step 2 in the execution table.

At which step is the value of x printed?

A Step 3

B Step 2

C Step 1

D No printing happens

💡 Hint

Look at the 'Output' column in the execution table.

If we change the code to x = x + 10 instead of x = x + 5, what will be the final value of x?

A 10

B 15

C 20

D 5

💡 Hint

Think about adding 10 to the initial value 10, as shown in the variable_tracker.

Concept Snapshot

Adding and updating values in Go:
- Declare variable: x := 10
- Update value: x = x + 5
- Variable holds new value after update
- Use fmt.Println(x) to print
- Variable changes immediately after update

Full Transcript

This example shows how to add and update values in Go. First, we declare a variable x with value 10. Then, we add 5 to x and update x with the new value 15. Finally, we print x, which outputs 15. The variable x changes its value immediately after the update statement. This is a simple way to change values stored in variables.