sum two strings without casting

It depends what you mean by 'casting'.

There's no casting in this, but there are conversions to and from numeric types:

string s3 = (long.Parse(s) + long.Parse(s2)).ToString();

However, it's possible to do it without using the conversion methods built into the .NET framework:

using System;

class Program

{

static void Main()

{

string s="1234566633434";

string s2="8934343433";

string sum = Add(s, s2);

Console.WriteLine(sum);

Console.ReadKey();

}

static string Add(string s1, string s2)

{

return (Helper(s1) + Helper(s2)).ToString();

}

static long Helper(string s)

{

int len = s.Length;

long sum = 0;

long multiplier = 1;

for(int i = len - 1; i >=0; i--)

{

sum += (s[i] - 48) * multiplier;

multiplier *= 10;

}

return sum;

}

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Vulpes13y ago
It depends what you mean by 'casting'.

There's no casting in this, but there are conversions to and from numeric types:

string s3 = (long.Parse(s) + long.Parse(s2)).ToString();

However, it's possible to do it without using the conversion methods built into the .NET framework:

using System;

class Program
{
static void Main()
{
string s="1234566633434";
string s2="8934343433";
string sum = Add(s, s2);
Console.WriteLine(sum);
Console.ReadKey();
}

static string Add(string s1, string s2)
{
return (Helper(s1) + Helper(s2)).ToString();
}

static long Helper(string s)
{
int len = s.Length;
long sum = 0;
long multiplier = 1;
for(int i = len - 1; i >=0; i--)
{
sum += (s[i] - 48) * multiplier;
multiplier *= 10;
}
return sum;
}
}