AlphaCodingSkills

C# - For Loop


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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:

In the below example, the program continue to print variable called i from value 1 to 5. After that, it exits from the for loop.

using System;

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

Output

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 below example.

using System;

namespace MyApplication { 
  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);
      } 
    }
  }
}

Output

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

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