42
loading...
C# loops
In this article, we'll learn about how to use loops in C#.
In C# there are 4 types of loops available -
The for loop is a basic loop that is available in almost all programming languages. It executes a block of statements until a specified expression evaluates to false.
for(initialValue; condition; iterator)
{
statements...
}The above code executes the statements inside parentheses until the condition evaluates to false.
for(int i = 0; i < 5; i++)
{
Console.WriteLine(i);
}The foreach loop in C# is used to iterate over the instance of the type that implements the
IEnumerable or IEnumerable<T> interface. In other words, it is used to iterate over an array or collection. foreach(type variable in collection)
{
statements...;
}In this example we'll use a simple array of integers.
int[] numbers = {1,2,3,4,5};
foreach(int number in numbers)
{
Console.WriteLine(number);
}The above lines will print all the numbers in the list
numbers.1
2
3
4
5In this example, we are going to use collections.
using System.Collections.Generic;
...
...
List<string> people = new List<string> {"John","Smith","Josh","Walton"};
foreach(string name in people)
{
Console.WriteLine(name);
}The above lines will print all the names from the collection
people.John
Smith
Josh
WaltonThe while loop executes a block of statements while an expression evaluates to true.
while(condition)
{
statements...
}int j = 0;
while (j<5)
{
Console.Write(j);
j++;
}The do-while loop executes a block of statements while an expression evaluates to true. The only difference in this and while loop is that, it executes the block at least one time since the condition is checked after the execution of the loop.
do
{
statements...
} while (condition)int k = 1;
do
{
Console.Write(k);
k++;
} while(k<5)42