Programming languages like Javascript, C++, C#, Python provides while loops in order to iterate over the given list, array, set etc. while loop is a very important part of the programming language because of its functionality. In this tutorial, we will examine and compare while loop for programming languages like Javascript, C++, C#, and Python.

Javascript while loop

Javascript provides different syntax of while loops. The general syntax is like below.

Only Condition

We just need to provide condition after the while keyword.

while (CONDITION) {
    CODE
}

In this example, we will increase the i variable and check whether it is lower than 5.

while (i < 5){

    text += "Value is " + i;
    i++;
}

Condition After While Block

We can also define condition check after the while block. This will ensure that the while block will be executed at least one time and checked after execution.

do {
    CODE
}
while (CONDITION);

In this example we will first increase the i variable and then check whether its lower than 5

do{

    text += "Value is " + i;
    i++;
}while (i < 5);

C and C++ while loop

C and C++ programming languages are using very similar syntax. Their while loop is very similar to the Javascript because Javascript derived some syntax from these languages.

Only Condition

We just need to provide condition after the while keyword.

while (CONDITION) {
    CODE
}

In this example, we will increase the i variable and check whether it is lower than 5.

while (i < 5){

    printf("Value is %d", i);
    i++;
}

Condition After While Block

We can also define condition check after the while block. This will ensure that the while block will be executed at least one time and checked after execution.

do {
    CODE
}
while (CONDITION);

In this example we will first increase the i variable and then check whether its lower than 5

do{

    printf("Value is %d", i);
    i++;
}while (i < 5);

C# while loop

C# programming language uses very similar concepts of the C and C++ programming language. We can use the following code in order to loop with a while. In this example, we will write i variable value to the console and check whether it is lower than 5.

using System;

class Program
{
    static void Main()
    {

        int i = 0;
        while (i < 5)
        {
            Console.WriteLine(i);

            i++;
        }
    }
}

Do While

We can also implement the same logic with do while operations.

using System;

class Program
{
    static void Main()
    {
        int i = 0;

        do
        {
            Console.WriteLine(i);

            i++;
        } while (i<= 5);
    }
}

Python while loop

Python is a bit different language from other counterparts like Javascript, C , C++, and C#. Python uses indents as block specifier so we will start while block with 3 spaces. In this example, we will check the variable i if it is lower than 5 and then print it.

i = 1
while i < 5:
   print(i)
   i += 1