Increment and decrement in Go - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the increment operator ++ do in Go?

It increases the value of a variable by 1. For example, i++ adds 1 to i.

beginner

How do you decrease a variable's value by 1 in Go?

Use the decrement operator --. For example, i-- subtracts 1 from i.

intermediate

Can you use ++ or -- as part of an expression in Go?

No. In Go, ++ and -- are statements, not expressions. You cannot write j = i++ like in some other languages.

beginner

Show a simple Go code snippet that increments a variable count by 1.

<pre>package main
import "fmt"

func main() {
    count := 0
    count++
    fmt.Println(count) // Output: 1
}</pre>

intermediate

Why can't you write ++i or --i in Go?

Go does not support prefix increment or decrement operators. Only postfix i++ and i-- are allowed.

What does i++ do in Go?

A Divides i by 2

B Subtracts 1 from i

C Adds 1 to i

D Multiplies i by 2

i++ increases the value of i by 1.

Which of these is valid in Go?

A i++

B j = i++

C ++i

D j = ++i

Only i++ as a statement is valid. You cannot use ++ as part of an expression.

What happens if you write i-- in Go?

A Syntax error

B i increases by 1

C i is set to zero

D i decreases by 1

i-- subtracts 1 from i.

Can you write ++i in Go?

A No, Go only supports postfix <code>i++</code>

B Yes, it works like in C

C Yes, but only inside loops

D No, Go does not support increment operators

Go only supports postfix increment and decrement operators.

Which of the following is a correct way to increment count in Go?

A count = count + 1

B Both A and B

C count++

D count += 2

You can increment by 1 using either count = count + 1 or count++.

Explain how increment and decrement operators work in Go and how they differ from other languages.

Think about how you write <code>i++</code> and if you can use it inside other expressions.

Write a short Go code snippet that declares a variable and increments it twice, then prints the result.

Use <code>var</code> or :=, then <code>++</code>, then <code>fmt.Println</code>.