Sololearn bug?

Question

So you type in 2 numbers and it’s supposed to output the first one, the second one, and then both

string x = Console.ReadLine();
Console.WriteLine(x[0]);
Console.WriteLine(x[1]);
Console.WriteLine(x[0] + x[1]);

Use 00 as example

And the output is:
0
0
96
???????????

Why does it say 96?

For 12 the output is
1
2
99? What?

Answer 1

ITDW

That is not a bug.

ASCII value of 0 is 48 so 00 will be 48 + 48 = 96

ASCII value of 1 is 49 so 01 = 48 + 49 = 97
ASCII value of 2 is 50 so 02 = 48 + 50 = 98

and addition of ASCII value of 1 & 2 = 49 + 50 = 99

Try 01 and 02

When you take 00 as a string so here 0 will be a character so when you add 0 and 0 then ASCII value will be add which is 48 + 48 = 96