Operator precedence in Go - Step-by-Step Execution

Concept Flow - Operator precedence

Start Expression

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Identify Operators

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Check Precedence Levels

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Evaluate Highest Precedence Operator

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Replace with Result

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Repeat Until One Value Left

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Final Result

The program looks at all operators in an expression, finds the one with the highest priority, calculates it first, then repeats until the whole expression is done.

Execution Sample

Go

package main
import "fmt"
func main() {
  result := 3 + 4 * 2
  fmt.Println(result)
}

Calculates 3 + 4 * 2 showing multiplication happens before addition.

Execution Table

Step	Expression	Operator Evaluated	Operation	Result
1	3 + 4 * 2	*	4 * 2	8
2	3 + 8	+	3 + 8	11
3	11	None	Final result	11

💡 No more operators left, final result is 11

Variable Tracker

Variable	Start	After Step 1	After Step 2	Final
result	undefined	undefined	11	11

Key Moments - 2 Insights

Why does multiplication happen before addition in the expression?

Because multiplication has higher precedence than addition, as shown in step 1 of the execution_table where 4 * 2 is calculated before adding 3.

What if we want addition to happen first?

We can use parentheses to change precedence, like (3 + 4) * 2, which would calculate addition first.

Visual Quiz - 3 Questions

Look at the execution_table, what is the result after step 1?

A 8

B 11

C 6

D Undefined

💡 Hint

Check the 'Result' column in row for step 1 in execution_table.

At which step does the addition operation happen?

A Step 3

B Step 1

C Step 2

D Never

💡 Hint

Look at the 'Operator Evaluated' column in execution_table.

If the expression was (3 + 4) * 2, what would be the first operation evaluated?

A 3 * 2

B 3 + 4

C 4 * 2

D No operation

💡 Hint

Parentheses change precedence, so addition inside () is first.

Concept Snapshot

Operator precedence decides which part of an expression is calculated first.
Multiplication and division have higher precedence than addition and subtraction.
Use parentheses () to change the order.
In Go, operators follow standard math precedence rules.
Example: 3 + 4 * 2 equals 3 + (4*2) = 11.

Full Transcript

Operator precedence in Go means some operations happen before others in an expression. For example, multiplication (*) happens before addition (+). In the code example, 3 + 4 * 2, the multiplication 4 * 2 is done first, resulting in 8, then 3 + 8 equals 11. This is shown step-by-step in the execution table. If you want addition first, use parentheses like (3 + 4) * 2. This concept helps avoid mistakes and write correct calculations.