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What conditional statements does Golang have? How to use conditional statements in Go programming? Let's find out together!
Decision making in programming is similar to decision making in real life. In this process, a piece of code is executed when a given condition is met. They are also sometimes called Control flow statements. Golang uses control statements to control the flow of execution of a program based on certain conditions. They are used to make the flow of execution advance and branch based on changes in the state of the program.
Basic conditional statements in Golang programming
This is the simplest decision statement. It is used to decide whether a statement or block of statements will be executed or not, i.e. if a condition is true then a block of statements will be executed, otherwise not.
Syntax:
if condition {
// Lệnh được thực thi nếu
// điều kiện đúng
}
Flow Chart:

For example:
// Go program to illustrate the
// use of if statement
package main
import "fmt"
func main() {
// lấy một biến cục bộ
var v int = 700
// dùng lệnh if để
// kiểm tra điều kiện
if v < 1000="" {="" in="" điều="" kiện="" if="" sau="" điều="" kiện="" đánh="" giá="" đúng="" fmt.printf("v="" is="" less="" than="" 1000\n")="" }="" fmt.printf("value="" of="" v="" is="" :="" %d\n",="" v)="" }="">
Result:
v is less than 1000
value of v is : 700
The else statement alone tells us that if the condition is true then it will execute a block of code and if the condition is false then it will not execute. But what if we want to do something else when the condition is false. This is where the else statement comes in. We can use the else statement with the if statement to execute a block of code when the condition is false.
Syntax:
if condition {
// Triển khai khối này nếu
// điều kiện đúng
} else {
// Triển khai khối này nếu
// điều kiện sai
}
For example:
// Go program to illustrate the
// use of if...else statement
package main
import "fmt"
func main() {
// taking a local variable
var v int = 1200
// dùng lệnh if
// kiểm tra điều kiện
if v < 1000="" {="" in="" if="" sau="" điều="" kiện="" đánh="" giá="" là="" dúng="" fmt.printf("v="" is="" less="" than="" 1000\n")="" }="" else="" {="" in="" ra="" nội="" dung="" sau="" nếu="" điều="" kiện="" được="" đánh="" giá="" là="" đúng="" fmt.printf("v="" is="" greater="" than="" 1000\n")="" }="" }="">
Result:
v is greater than 1000
In Go Language, nested if is a conditional statement that is the target of another if or else. This Golang statement means there are two if statements nested inside each other as the name suggests.
Syntax:
if condition1 {
// Triển khai khi condition1 đúng
if condition2 {
// Triển khai khi condition2 đúng
}
}
For example:
// Minh họa chương trình Go dùng lệnh if lồng nhau
package main
import "fmt"
func main() {
// lấy 2 biến cục bộ
var v1 int = 400
var v2 int = 700
// dùng lệnh if
if( v1 == 400 ) {
// điều kiện đúng thì kiểm tra nội dung sau
if( v2 == 700 ) {
// điều kiện đúng thì hiển thị nội dung sau
fmt.Printf("Value of v1 is 400 and v2 is 700\n" );
}
}
}
Result:
Value of v1 is 400 and v2 is 700
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