Comparing Loops in RPG and C#

Looping operations are quite similar in C# and RPG. Note that RPG uses 'EndDo' or 'EndFor' and C# uses curly braces {} as the beginning and end of a loop (or any code block for that matter).

Here's the different loops
A = 0; B=10
'Statements' is all the code in the loop that you wish to iterate over.

RPG Loop	C# Loop
DOW (A<b); statements EndDo;	While (a <b)  {statements}
FOR A = 1 to 10;  statements  EndFor;	For (int a=0; a<10; a++)  {statements}
DOU A > B; statements  EndDo;	Do   {statements} while (A >B);

 

Both languages have ways to skip statements or break out of the loop

iter;	Continue;
Leave;	break;

 

Here's sample code showing the C# while loop (same as RPG DOW)
Note that the While operation code has {} braces to denote the beginning and end of the loop.

The Do While loop...

            // The while loop
            // The while statement is equivalent to the RPG 'DOW'
            int ebayJunk = 0;
            int CreditLeft = 500;
            bool HaveMoney = true;

// The loop will execute as long as HaveMoney is true;
            while (HaveMoney) // checks before going into the loop
            { // beginning of while loop
                ebayJunk += 1;
                CreditLeft -= 100;
                Console.WriteLine("Useless Gadgets={0}", ebayJunk);
                Console.WriteLine("Money left=${0}", CreditLeft);

        if (CreditLeft <= 0) { HaveMoney = false; } // Set condition for while loop
                // Entire loop is executed a
            } // end of while loop (same as EndDO in RPG 
            Console.WriteLine("You're Broke!!");
            Console.ReadLine();
    

And the For loop....

// For loop example. Finds the first blank space in a string
// The block of code between the curly braces gets iterated
// over. The loop decrements from the length

String field = "To the Galaxy and Beyond";

for(int i = field.Length; i > 0; i--)

{
Console.WriteLine("Letter is not blank: "+ field[i - 1]);

if(field[i - 1] == ' ')   // note how I can treat a string like an array

    break; // exit once I reach a blank space

}

 

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