Why loop control is required in Go - Challenge Your Understanding

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of loop with break statement

What is the output of this Go program that uses a break statement inside a loop?

Go

package main
import "fmt"
func main() {
    for i := 1; i <= 5; i++ {
        if i == 3 {
            break
        }
        fmt.Print(i, " ")
    }
}

A 1 2

B 1 2 3

C 1 2 3 4 5

D 3 4 5

💡 Hint

The break statement stops the loop immediately when the condition is met.

The loop runs from 1 to 5, but when i equals 3, the break statement stops the loop. So only 1 and 2 are printed.

❓ Predict Output

intermediate

Output of loop with continue statement

What will this Go program print when it uses continue inside a loop?

Go

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

A 1 2 4 5

B 1 2 3 4 5

C 3

D 1 2

💡 Hint

The continue statement skips the current loop iteration when the condition is true.

When i is 3, continue skips printing it and moves to the next iteration. So 3 is missing in the output.

🧠 Conceptual

advanced

Why is loop control important in programming?

Why do programmers use loop control statements like break and continue in loops?

A To print output faster without delays

B To stop or skip parts of the loop based on conditions, improving efficiency and control

C To create new variables inside the loop automatically

D To make the loop run forever without stopping

💡 Hint

Think about how loops can be controlled to avoid unnecessary work or infinite loops.

Loop control statements help stop loops early or skip certain steps, making programs more efficient and easier to manage.

❓ Predict Output

advanced

Output of nested loops with break

What is the output of this Go program with nested loops and a break statement?

Go

package main
import "fmt"
func main() {
    for i := 1; i <= 3; i++ {
        for j := 1; j <= 3; j++ {
            if j == 2 {
                break
            }
            fmt.Printf("%d%d ", i, j)
        }
    }
}

A 11 12 21 22 31 32

B 11 21 22 31 32

C 11 12 13 21 22 23 31 32 33

D 11 21 31

💡 Hint

The break only stops the inner loop when j equals 2.

For each i, the inner loop prints j=1 then breaks when j=2, so only pairs with j=1 are printed.

❓ Predict Output

expert

Value of counter after loop with continue and break

What is the value of variable count after running this Go program?

Go

package main
import "fmt"
func main() {
    count := 0
    for i := 1; i <= 5; i++ {
        if i == 2 {
            continue
        }
        if i == 4 {
            break
        }
        count++
    }
    fmt.Println(count)
}

A 4

B 3

C 2

D 5

💡 Hint

Count increments only when continue and break conditions are not met.

i=1 increments count (count=1), i=2 skips increment (continue), i=3 increments count (count=2), i=4 breaks loop, so final count is 2.