Algorithm

Initialize Loop Variable:

    • Declare and initialize the loop variable before entering the loop.
go
i := 0

  1. While Loop Condition:

    • Use a for loop with a condition to create the equivalent of a while loop.
    go
    for i < 5 {
    // Loop body
}

  2. Loop Body:

    • Define the statements that should be executed as long as the loop condition is true.
    go
    fmt.Println(i)

  3. Update Loop Variable:

    • Modify the loop variable within the loop body to eventually meet the exit condition.
    go
    i++

  4. End of Loop:

    • The loop will continue executing as long as the condition is true. Once the condition becomes false, the control exits the loop.

 

Flowchart of while loop in Go ::

 

 +---------------------+
|  Start of Program   |
+---------------------+
           |
           v
+---------------------+
|   Initialize       |
|   Loop Variable    |
+---------------------+
           |
           v
+---------------------+
|       +-------<-----+
|       |
|       v
|   +-----------------+
|   |   Condition     |
|   |   Check         |
|   +-----------------+
|       |
|       v
|   +-----------------+
|   |  Loop Body      |
|   |  Executed       |
|   +-----------------+
|       |
|       v
|   +-----------------+
|   |   Update        |
|   |   Loop Variable |
|   +-----------------+
|       |
|       v
|   +-----------------+
|   |   Back to       |
|   |   Condition     |
|   +-----------------+
|       |
|       |
|       v
|   +---<-------------+
|   |
+---+
|
v
+---------------------+
|  End of Program     |
+---------------------+

 

Code Examples

#1 Go while loop

Code - Golang Programming

// Program to print numbers between 1 and 5

package main
import ("fmt")

func main() {
  number := 1

  for number <= 5 {
    fmt.Println(number)
    number++
  }
}
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Output

x
–
+
cmd
1
2
3
4
5

#2 Create multiplication table using while loop

Code - Golang Programming

// Program to create a multiplication table of 5 using while loop

package main
import ("fmt")

func main() {
  multiplier := 1

  // run while loop for 10 times
  for multiplier <= 10 {

    // find the product
    product := 5 * multiplier

    // print the multiplication table in format 5 * 1 = 5
    fmt.Printf("5 * %d = %d\n", multiplier, product)
    multiplier++
  }

}
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Output

x
–
+
cmd
5 * 1 = 5
5 * 2 = 10
5 * 3 = 15
5 * 4 = 20
5 * 5 = 25
5 * 6 = 30
5 * 7 = 35
5 * 8 = 40
5 * 9 = 45
5 * 10 = 50

#3 Go do...while Loop

Code - Golang Programming

// Program to print number from 1 to 5

package main
import "fmt"

func main(){
  number := 1

  // loop that runs infinitely
  for {

    // condition to terminate the loop
    if number > 5 {
      break;
    }

    fmt.Printf("%d\n", number);
    number ++

  }
}
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Output

x
–
+
cmd
1
2
3
4
5
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Demonstration

Go Lang Programming  while Loop