"for" Loop Statements

C# Tutorials - Herong's Tutorial Examples

∟"for" Loop Statements

This section provides a tutorial example on how to use a 'for' loop statement to calculate the sum of integers between 1 and 10.

A "for" loop is a "for" statement, by which a group of embedded statements will repeatedly executed like a loop until the controlling condition reaches false. Here is the syntax of a "for" statement:

for statement:
   for (initiation_statement; logical_expression; iteration_statement) {
      embedded_statements
   )

When a "for" statement is encountered in an execution flow, it will follow the algorithm bellow:

Step 1: Executed the initiation statement.
Step 2: Evaluate the logical expression.
Step 3: If the resulting value of the logical expression is true, run all the embedded statements; otherwise, end this "for" statement.
Step 4: After executing the embedded statements, if they are executed as part of Step 3, executed the iteration statement, and loop back to Step 2.

The following program uses a "for" loop to calculate the sum of integers from 1 to 10:

// ForLoops.cs
// Copyright (c) 2006 HerongYang.com. All Rights Reserved.

class ForLoops {
   static void Main() {
      long total;
      total = 0;
      int i;
      for (i=1; i<=10; i=i+1) {
         total = total + i;
      }
      System.Console.WriteLine("Sum of 1, 2, ..., 10: {0}", total);
   }
}