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how can i do my project?
string str1="4567995244...4457";
string str2="1458795568...85498";

str1+str2; // addition
str1-str2; // differance
str1*str2; // multiplication
str1/str2; // division

note: we dont use biginteger class also
we dont use arithmetic operatiors
Updated 29-Dec-12 5:44am
Sergey Alexandrovich Kryukov 29-Dec-12 21:53pm    
What's wrong with BigInteger?

If I understood your question correctly, you first have to change the data type to something you can use in calculation. For example:
int a = int.Parse("123") + int.Parse("456");

Of course you would use variables inside TryParse instead of constant strings.
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Sergey Alexandrovich Kryukov 29-Dec-12 21:50pm    
Parse is better, because this API name correctly tell us what really happens, unlike "Convert". My 5.
Wendelius 4-Jan-13 15:07pm    
That's true, thanks :)
If BigInteger is not good enough, look around here:[^]
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Sergey Alexandrovich Kryukov 29-Dec-12 21:53pm    
Interesting, my 5. However, OP's idea about not using BigInteger is not motivated; most likely, this is just a mistake. As a rule of thumb, OP's "I want" or "I don't want" cannot be taken seriously.
Zoltán Zörgő 30-Dec-12 2:55am    
Probably. But most likely the OP was told to implement these basic operation as pure symbol/string manipulation.
Sergey Alexandrovich Kryukov 30-Dec-12 13:16pm    

Try this:
string str1="4567995244...4457";
string str2="1458795568...85498";

decimal d1 = Convert.ToDecimal(str1);
decimal d2 = Convert.ToDecimal(str2);

decimal addition = d1+d2; // addition
decimal difference = d1-d2; // difference
decimal multiplication = d1*d2; // multiplication
decimal division = d1/d2; // division


I've read your comment. So, this is my edit.
Orhss wrote:
note: we dont use biginteger class also

I think there's no other option then using a BigInteger. Add a reference to System.Numerics.dll, add
using System.Numerics;
to the top of your code file, and then use this code:
BigInteger b1 = BigInteger.Parse(str1);
BigInteger b2 = BigInteger.Parse(str2);

BigInteger addition = b1 + b2;
BigInteger difference = b1 - b2;
BigInteger multiplication = b1 * b2;
BigInteger division = b1 / b2;

Hope this helps.
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ridoy 29-Dec-12 12:20pm    
Thomas Daniels 29-Dec-12 12:21pm    
Thank you!
Orhss 29-Dec-12 12:33pm    
your solution is true but we should use very long string
like this...
Thomas Daniels 29-Dec-12 12:49pm    
I updated my answer.
Orhss 29-Dec-12 13:25pm    
right,but we should not use biginteger class and arithmetic operations

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