Continue statement in Go - Mini Project: Build & Apply

Using the Continue Statement in Go

📖 Scenario: Imagine you are checking a list of daily temperatures to find which days were warm enough to go outside. You want to skip cold days and only note the warm days.

🎯 Goal: You will write a Go program that uses the continue statement inside a loop to skip cold days and print only the warm days.

📋 What You'll Learn

Create a slice of integers called temperatures with the exact values: 15, 22, 8, 19, 30, 12

Create an integer variable called warmThreshold and set it to 20

Use a for loop with the variable temp to go through temperatures

Inside the loop, use continue to skip temperatures less than warmThreshold

Print each warm temperature using fmt.Println(temp)

💡 Why This Matters

🌍 Real World

Filtering data based on conditions is common in many programs, like showing only important messages or selecting items that meet certain criteria.

💼 Career

Understanding how to use loops and control statements like <code>continue</code> helps you write efficient code that processes data correctly, a skill needed in software development.

1

Create the temperatures slice

Create a slice of integers called temperatures with these exact values: 15, 22, 8, 19, 30, 12

Go

// Create the temperatures slice with the exact values
// Your code here

Hint

Use temperatures := []int{...} to create the slice with the exact numbers.

2

Add the warmThreshold variable

Create an integer variable called warmThreshold and set it to 20

Go

package main

func main() {
    temperatures := []int{15, 22, 8, 19, 30, 12}
    // Create warmThreshold variable and set it to 20
    // Your code here
}

Hint

Use warmThreshold := 20 to create the variable.

3

Use a for loop with continue to skip cold days

Use a for loop with the variable temp to go through temperatures. Inside the loop, use continue to skip temperatures less than warmThreshold

Go

package main

func main() {
    temperatures := []int{15, 22, 8, 19, 30, 12}
    warmThreshold := 20

    // Loop through temperatures and skip cold days
    // Your code here
}

Hint

Use for _, temp := range temperatures to loop. Use if temp < warmThreshold { continue } to skip cold days.

4

Print the warm temperatures

Inside the loop, after the continue statement, print each warm temperature using fmt.Println(temp)

Go

package main

import "fmt"

func main() {
    temperatures := []int{15, 22, 8, 19, 30, 12}
    warmThreshold := 20

    for _, temp := range temperatures {
        if temp < warmThreshold {
            continue
        }
        // Print the warm temperature
        // Your code here
    }
}

Hint

Use fmt.Println(temp) to print the warm temperatures inside the loop.

Practice

1. What does the continue statement do inside a loop in Go?

easy

A. Skips the rest of the current loop iteration and moves to the next iteration

B. Stops the entire loop immediately

C. Exits the current function

D. Repeats the current iteration without moving forward

Solution

1. Step 1: Understand the role of continue in loops

   The continue statement tells the loop to skip the remaining code in the current iteration.

2. Step 2: Identify what happens after continue

   After skipping, the loop moves on to the next iteration without stopping the whole loop.

3. Final Answer:

   Skips the rest of the current loop iteration and moves to the next iteration -> Option A

4. Quick Check:

   continue skips current step [OK]

Hint: Remember: continue skips current step, not whole loop [OK]

Common Mistakes:

• Confusing continue with break
• Thinking continue exits the function
• Assuming continue repeats the iteration

2. Which of the following is the correct syntax to use continue inside a for loop in Go?

easy

A. continue

B. continue {}

C. continue()

D. continue;

Solution

1. Step 1: Recall Go syntax for statements

   In Go, continue is a keyword used alone without parentheses or semicolons.

2. Step 2: Identify the correct form

   The correct usage is simply continue by itself inside the loop.

3. Final Answer:

   continue -> Option A

4. Quick Check:

   Go statements like continue have no parentheses or semicolons [OK]

Hint: Use continue alone, no parentheses or semicolon needed [OK]

Common Mistakes:

• Adding semicolon after continue
• Using continue as a function with parentheses
• Using braces {} after continue

3. What will be the output of the following Go code?

for i := 1; i <= 5; i++ {
    if i == 3 {
        continue
    }
    fmt.Print(i, " ")
}

medium

A. 1 2 3 4 5

B. 1 2

C. 3 4 5

D. 1 2 4 5

Solution

1. Step 1: Analyze the loop and condition

   The loop runs from 1 to 5. When i equals 3, continue skips printing 3.

2. Step 2: Determine printed values

   Values 1, 2, 4, and 5 are printed with spaces. Number 3 is skipped.

3. Final Answer:

   1 2 4 5 -> Option D

4. Quick Check:

   continue skips printing 3 [OK]

Hint: Skip printing when continue hits condition [OK]

Common Mistakes:

• Including 3 in output
• Stopping loop instead of skipping
• Printing nothing due to misunderstanding continue

4. Identify the error in this Go code snippet using continue:

for i := 0; i < 5; i++ {
    if i == 2 {
        continue()
    }
    fmt.Println(i)
}

medium

A. The loop condition is incorrect

B. fmt.Println is used incorrectly

C. Using parentheses with continue causes a syntax error

D. continue should be replaced with break

Solution

1. Step 1: Check the usage of continue

   In Go, continue is a statement without parentheses. Using continue() causes a syntax error.

2. Step 2: Verify other parts

   The loop condition and fmt.Println usage are correct. The error is only in the continue syntax.

3. Final Answer:

   Using parentheses with continue causes a syntax error -> Option C

4. Quick Check:

   continue has no parentheses in Go [OK]

Hint: Don't add parentheses after continue [OK]

Common Mistakes:

• Writing continue() instead of continue
• Confusing continue with break
• Misreading loop condition as error

5. You want to print all numbers from 1 to 10 except multiples of 3 using a for loop and continue. Which code snippet correctly achieves this?

hard

A. for i := 1; i <= 10; i++ {
if i % 3 != 0 {
continue
}
fmt.Println(i)
}

B. for i := 1; i <= 10; i++ {
if i % 3 == 0 {
continue
}
fmt.Println(i)
}

C. for i := 1; i <= 10; i++ {
if i % 3 == 0 {
break
}
fmt.Println(i)
}

D. for i := 1; i <= 10; i++ {
if i % 3 == 0 {
fmt.Println(i)
continue
}
}

Solution

1. Step 1: Understand the goal

   We want to skip printing numbers divisible by 3 and print all others from 1 to 10.

2. Step 2: Analyze each option

   for i := 1; i <= 10; i++ { if i % 3 == 0 { continue } fmt.Println(i) } skips printing multiples of 3 using continue correctly. for i := 1; i <= 10; i++ { if i % 3 != 0 { continue } fmt.Println(i) } skips non-multiples, printing only multiples. for i := 1; i <= 10; i++ { if i % 3 == 0 { break } fmt.Println(i) } breaks the loop early. for i := 1; i <= 10; i++ { if i % 3 == 0 { fmt.Println(i) continue } } prints multiples and skips others incorrectly.

3. Final Answer:

   for i := 1; i <= 10; i++ { if i % 3 == 0 { continue } fmt.Println(i) } -> Option B

4. Quick Check:

   continue skips multiples of 3, print others [OK]

Hint: Use if condition with continue to skip unwanted values [OK]

Common Mistakes:

• Using break instead of continue
• Reversing the condition logic
• Printing inside the continue block