Someone please explain this code

Question

I want complete explanation of the output
https://code.sololearn.com/c2sybx3q36Pb/?ref=app

Answer 1

See this line?

return ~(partner * -1);

The tilde ~ here is bitwise NOT operator. Read about it below 👇

https://www.sololearn.com/learn/4076/?ref=app

When we apply arithmetic operation on a `char`, computer will use the ASCII code of the `char` as value for the arithmetic operation.

ASCII code for letter 'K' is 75, so the expression inside the parentheses

( partner * -1 )

Effectively inverts the sign of the ASCII code from (75) to (-75).

And next the bitwise NOT operator does its work, which inverts the sign of the result (-75) back into (75), and reduce it by one, so it results in (74), the ASCII code for character 'J'.

Hope it makes sense ...

Answer 2

Letter before K?

Ans - J

Answer 3

This program returns the letter / character that comes before the one you proved it.

For example: printf("%c", agentName('B'));
the program will output: A

Another example: printf("%c", agentName('5'));
the program will output: 4

Answer 4

Carbon but can you explain me how it works. I know it outputs the preceding character but how? I don't understand the operation of this program