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C# - For Loop



The for loop executes a set of statements in each iteration. Whenever, number of iteration is known, for loop is preferred over while loop.

Syntax

for(initialization(s); condition(s); counter_update(s);){
  statements;
} 

  • Initialization(s): Variable(s) is initialized in this section and executed for one time only.
  • Condition(s): Condition(s) is defined in this section and executed at the start of loop everytime.
  • Counter Update(s): Loop counter(s) is updated in this section and executed at the end of loop everytime.

Flow Diagram:

cs For Loop

Example:

Multiple initializations, condition checks and loop counter updates can be performed in a single for loop. In the example below, two variable called i and j are initialized, multiple conditions are checked and multiple variables are updated in a single for loop.

using System;

class MyProgram {
  static void Main(string[] args) {
    for (int i = 1; i <= 5; i++){
      Console.WriteLine(i);
    } 
  }
}

The output of the above code will be:

1
2
3
4
5

Example

Multiple initializations, condition checks and loop counter updates can be performed in a single for loop. Please see the example below.

using System;
 
class MyProgram {
  static void Main(string[] args) {
    for (int i = 1, j = 100;   i <= 5 || j <= 800;   i++, j = j + 100){
      Console.WriteLine("i=" + i + ", j=" + j);
    } 
  }
}

The output of the above code will be:

i=1, j=100
i=2, j=200
i=3, j=300
i=4, j=400
i=5, j=500
i=6, j=600
i=7, j=700
i=8, j=800

5