[Author: @mdimamhosen Date: 2025-04-19 Category: interview-qa/conditional-statements Tags: [go, conditional-statements, if-else] ]
Go Conditions
Conditional statements allow us to control the structure of our program.
There are different ways by which we can control the flow of our program, (If, else if, else) are one of them.
(If, else if, else) statments allow us to make "decisions" while our program is running, They're also called (conditional statments) in programming.
// Sudo Syntax
if condition { <code> }
else if condition { <code> }
else { <code> }
// Actual Code
package main
import "fmt"
func main() {
password := "12345678"
if len(password) > 7 {
fmt.Println("Valid Password")
} else {
fmt.Println("Invalid Password")
}
}
Frequently Asked Questions (FAQs)
1. What is the syntax of an if-else statement in Go?
Answer: The syntax of an if-else statement in Go is as follows:
if condition {
// code to execute if condition is true
} else {
// code to execute if condition is false
}
Example:
package main
import "fmt"
func main() {
number := 10
if number%2 == 0 {
fmt.Println("Even Number")
} else {
fmt.Println("Odd Number")
}
}
2. Can we use an if statement without an else block?
Answer: Yes, an if statement can be used without an else block. Example:
package main
import "fmt"
func main() {
number := 5
if number > 0 {
fmt.Println("Positive Number")
}
}
3. What is an else-if ladder in Go?
Answer: An else-if ladder is used to check multiple conditions sequentially. Example:
package main
import "fmt"
func main() {
score := 85
if score >= 90 {
fmt.Println("Grade: A")
} else if score >= 75 {
fmt.Println("Grade: B")
} else {
fmt.Println("Grade: C")
}
}
4. How do you use a short statement in an if condition?
Answer: A short statement can be used to initialize a variable within an if condition. Example:
package main
import "fmt"
func main() {
if num := 10; num%2 == 0 {
fmt.Println("Even Number")
}
}
5. Can we nest if-else statements in Go?
Answer: Yes, if-else statements can be nested. Example:
package main
import "fmt"
func main() {
number := 15
if number > 0 {
if number%2 == 0 {
fmt.Println("Positive Even Number")
} else {
fmt.Println("Positive Odd Number")
}
} else {
fmt.Println("Non-Positive Number")
}
}
6. What is the difference between if-else and switch statements?
Answer: If-else is used for conditional branching, while switch is used for selecting one of many blocks of code. Example:
package main
import "fmt"
func main() {
day := 3
switch day {
case 1:
fmt.Println("Monday")
case 2:
fmt.Println("Tuesday")
case 3:
fmt.Println("Wednesday")
default:
fmt.Println("Invalid Day")
}
}
7. How do you handle multiple conditions in a single if statement?
Answer:
Logical operators like && (AND) and || (OR) can be used to handle multiple conditions.
Example:
package main
import "fmt"
func main() {
number := 15
if number > 0 && number%3 == 0 {
fmt.Println("Positive and Divisible by 3")
}
}
8. What happens if the condition in an if statement is not a boolean?
Answer: In Go, the condition in an if statement must evaluate to a boolean. Otherwise, it will result in a compilation error. Example:
// This will cause a compilation error
// if 10 {
// fmt.Println("Invalid Condition")
// }
9. Can we use a function call in an if condition?
Answer: Yes, a function call can be used in an if condition. Example:
package main
import "fmt"
func isEven(num int) bool {
return num%2 == 0
}
func main() {
if isEven(10) {
fmt.Println("Even Number")
}
}
10. How do you use if-else with user input?
Answer:
You can use the fmt.Scan function to take user input and use it in an if-else statement.
Example:
package main
import "fmt"
func main() {
var age int
fmt.Print("Enter your age: ")
fmt.Scan(&age)
if age >= 18 {
fmt.Println("You are eligible to vote.")
} else {
fmt.Println("You are not eligible to vote.")
}
}