chars and percent - C#

[lubblig]

When I do:

double val = 0;val = 'z' % 'a';Console.Write(val.ToString());

The console returns 25

 

But when I do:

double val = 0;val = 'a' % 'z';Console.Write(val.ToString());

It returns 97.

 

 

So what I've concluded so far is that 'a' is 97 in the ascii table and 'z' is 122.

 

In the first case it did (I guess?) 122-97 that equals 25.

But in the second case where I did 97-122 it returns 97 but I don't know why.

 

I'm thinking it might be some weird thing that it cannot equal a negative number (since 97-122 would be -25) and therefore returns the first value.

 

 

So the real question I guess is, have I understood this correctly and why does it not return negatives? I basically want an explanation to what's happening because I cannot fully understand it.

 

Thanks!

[79wjd]

% is modulo, which is used in order to determine overflow/remainders. 

 

I'm terrible at explaining this, so I'll just leave an example: 

97%122 = 97

97%97=0

97%96=1

97%98 = 97

 

https://en.wikipedia.org/wiki/Modular_arithmetic

[NeatSquidYT]

% is modulo, which is used in order to determine overflow/remainders. 

 

I'm terrible at explaining this, so I'll just leave an example: 

97%122 = 97

97%97=0

97%96=1

97%98 = 97

 

https://en.wikipedia.org/wiki/Modular_arithmetic

^^

 

although 97/122 = 0.79508196721

[lubblig]

% is modulo, which is used in order to determine overflow/remainders. 

 

I'm terrible at explaining this, so I'll just leave an example: 

97%122 = 97

97%97=0

97%96=1

97%98 = 97

Ehm, ok...

 

So, 97%96 means that there is a reminder of 1?

And 97%122 means that there is an overflow and returns 97?

 

Is that right?

 

If yes, then why does 97%122 return 97? Why not something easier to understand (or something...)?

[Nineshadow]

% in computer science is modulo most of the time.

 

97%122 returns 97 because 97 = 122 * 0 + 97. (the reminder theorem : If a/b = c and a remainder , r , then a = b*c + r)

[79wjd]

Ehm, ok...

 

So, 97%96 means that there is a reminder of 1?

And 97%122 means that there is an overflow and returns 97?

 

Is that right?

 

If yes, then why does 97%122 return 97? Why not something easier to understand (or something...)?

Because modulo arithmetic is very useful the way it is (and it's like that because of the way it works). 

It returning 97 is actually a good thing. 

 

Say I wanted to iterate through an array infinitely with entries being overwritten when I've exceeded the size of the array. If 97%122 returned anything other than 97, then I would have to computer 97 from whatever the return value was if I wanted to write whatever data I had to element 97. 

[lubblig]

Because modulo arithmetic is very useful the way it is (and it's like that because of the way it works). 

It returning 97 is actually a good thing. 

 

Say I wanted to iterate through an array infinitely with entries being overwritten when I've exceeded the size of the array. If 97%122 returned anything other than 97, then I would have to computer 97 from whatever the return value was if I wanted to write whatever data I had to element 97. 

Oh ok. I'm not 100 percent sure what a modulo is and G translate doesn't help me getting it right in my own language either.

 

But I think I sort of understand how it works now. I guess I have to read about what exactly modulo's are to fully understand it.

 

Thanks for the help!

[fizzlesticks]

% in computer science is modulo.

Depends on the language, % could also mean remainder.

[Nineshadow]

Note, if you want to use percents , just use rational numbers (float).

Eg.

50% = 0.5

25.784% = 0.25784

187,9% = 1.879

[Nineshadow]

Depends on the language, % could also mean remainder.

Isn't it the same thing?

[fizzlesticks]

Isn't it the same thing?

They're different for negative numbers.

In C, -4 % 5 = -4

In Python -4 % 5 = 1

[Nineshadow]

They're different for negative numbers.

In C, -4 % 5 = -4

In Python -4 % 5 = 1

Ah...

[lubblig]

Note, if you want to use percents , just use rational numbers (float).

Eg.

50% = 0.5

25.784% = 0.25784

187,9% = 1.879

Yeah, I know. This was like an extra part of an assignment that I had in a programming course in school. We were basically only supposed to test it and see what happens. But since I didn't understand the result I thought I'd ask here. But thanks anyway.