call by reference
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hi, thanks a lot Navneeth ......your message realy helped.....i have altered the code a bit ......can you check and tell me whether my synatax is correct or not. i tried to run it and its running fine ....but i need your comment also....in the main function i made a slight alteration from yours.....plz check that and inform me class Program { public static int Add(ref int x, ref int y) { int a = x; //saying that henceforth a will represent x int b y ; //saying that henceforth b will represent y int result = a + b; Console.WriteLine("{0}", result); return 10; } static void Main(string[] args) { int a = 10; //passing values to a and b int b = 20; int sum = Add(ref a,ref b); Console.WriteLine("{0}", sum); Console.ReadLine(); } } }
C#
kabutar wrote:
return 10;
Why this return ? You have to return the result here. Remaining all looks fine. Hope you are cleared with call by reference and value concepts and how it works.
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kabutar wrote:
return 10;
Why this return ? You have to return the result here. Remaining all looks fine. Hope you are cleared with call by reference and value concepts and how it works.
hi, Navneeth what i was trying to do here is that i need the value of 10 to be returned... ie we can say return a; the value assigned to a is 10... so that value of a =10 will be returned ans stored inside sum so that we can use it for some other operation..... am i correct Navneeth......?? also one more doubt in your code u have used a,b and first number and second number .what is the purpose of those..... ie we have declred x and y as ref variables and are given refrence to a andf b..... so what is the use of using firstnumber and secondnumber..... please explain ..... thanks again for comming to my help
C#
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hi, Navneeth what i was trying to do here is that i need the value of 10 to be returned... ie we can say return a; the value assigned to a is 10... so that value of a =10 will be returned ans stored inside sum so that we can use it for some other operation..... am i correct Navneeth......?? also one more doubt in your code u have used a,b and first number and second number .what is the purpose of those..... ie we have declred x and y as ref variables and are given refrence to a andf b..... so what is the use of using firstnumber and secondnumber..... please explain ..... thanks again for comming to my help
C#
kabutar wrote:
also one more doubt in your code u have used a,b and first number and second number .what is the purpose of those.
It was a typing mistake. corrected now.
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kabutar wrote:
also one more doubt in your code u have used a,b and first number and second number .what is the purpose of those.
It was a typing mistake. corrected now.
Thanks a lot ..........:) cheers to you i understood something that i always had difficulty in understanding.... :) :)
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kabutar wrote:
also one more doubt in your code u have used a,b and first number and second number .what is the purpose of those.
It was a typing mistake. corrected now.
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hello, i want to do the same thing using ""call by refernce method""....can anybody alter the code andf show to me the differnce please.... here i am using call by value i want to do this using call byt reference.....please the codes but the functionality should be the same so that it will be easy to understand,,,,thanks class Program { public static int Add(int x, int y) { int result = a + b; Console.WriteLine("{0}", result); Console.ReadLine(); return 10; } static void Main(string[] args) { int sum = Add(10, 20); Console.WriteLine("{0}", sum); Console.ReadLine(); } } }
C#
You call by reference so you can change the parameters within the call. You sample has no benefit using references. A better example would be
public static void Add(int x, int y , ref int result) { result = x + y; } static void Main(string[] args) { int x = 5; int y = 5; int result = 0; Add(x , y , ref result); Console.WriteLine("{0}", result); Console.ReadLine(); }Here, the Add method has no internal members. It uses the pass by valuexandy(by value so they can't change) to populateresult, passed by reference so it can change. Within the Add signature, the parameters can be called different names....public static void Add(int firstValue , int secondValue , ref int firstValueAddedToSecondValue) { firstValueAddedToSecondValue = firstValue + secondValue; } static void Main(string[] args) { int x = 5; int y = 5; int result = 0; Add(x , y , ref result); Console.WriteLine("{0}", result); Console.ReadLine(); }The advantage of this method, is you can then use a return value for success or failure of your Add function (if it becomes more complex)public static bool Add(int x, int y, ref int result) { try { result = ReallyComplexCalculationDoneBy3rdPartyLib( x , y ); } catch( Exception e ) { //handle exception - this is for example only return false; } return true; } static void Main(string[] args) { int x = 5; int y = 5; int result = 0; bool AddWorked = Add(x , y , ref result); if (AddWorked) Console.WriteLine("{0}", result); else Console.WriteLine("Addition failed - check log file..etc"); Console.ReadLine(); }Hope this helps."More functions should disregard input values and just return 12. It would make life easier." - comment posted on WTF
"This time yesterday, I still had 24 hours to meet the deadline I've just missed today."
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Thanks a lot ..........:) cheers to you i understood something that i always had difficulty in understanding.... :) :)
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How about
public static int Add(object x,object y)
{
int First;
int Second;
try
{
First = (int)x;
Second = (int)y;
return First + Second;
}
catch(Exception ex)
{
throw new Exception("Invalid values");
}
return 0;
}
That's not sending argument by reference, that's sending references as arguments.
--- "Anything that is in the world when you're born is normal and ordinary and is just a natural part of the way the world works. Anything that's invented between when you're fifteen and thirty-five is new and exciting and revolutionary and you can probably get a career in it. Anything invented after you're thirty-five is against the natural order of things." -- Douglas Adams
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That's not sending argument by reference, that's sending references as arguments.
--- "Anything that is in the world when you're born is normal and ordinary and is just a natural part of the way the world works. Anything that's invented between when you're fifteen and thirty-five is new and exciting and revolutionary and you can probably get a career in it. Anything invented after you're thirty-five is against the natural order of things." -- Douglas Adams
Guffa wrote:
hat's not sending argument by reference, that's sending references as arguments.
Yes that was a mistake. I corrected that in second post
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Guffa wrote:
hat's not sending argument by reference, that's sending references as arguments.
Yes that was a mistake. I corrected that in second post
Why didn't you just edit the post?
--- "Anything that is in the world when you're born is normal and ordinary and is just a natural part of the way the world works. Anything that's invented between when you're fifteen and thirty-five is new and exciting and revolutionary and you can probably get a career in it. Anything invented after you're thirty-five is against the natural order of things." -- Douglas Adams