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What is this format specifier? (lemm.ee)

submitted 1 year ago* (last edited 1 year ago) by milon@lemm.ee to c/programming@programming.dev

33 comments fedilink hide all child comments

What is %.2f? Why is it not just %f? Is there some additional calculation happening? The half function already does all the calculations including splitting the bill, so I'm not sure what %.2f is. (Btw why is this code not formatting correctly in lemmy?)


#include 
#include 

float half(float bill, float tax, int tip);

int main(void)
{
    float bill_amount = get_float("Bill before tax and tip: ");
    float tax_percent = get_float("Sale Tax Percent: ");
    int tip_percent = get_int("Tip percent: ");

    printf("You will owe $%.2f each!\n", half(bill_amount, tax_percent, tip_percent));
}

// TODO: Complete the function
float half(float bill, float tax, int tip)
{
    bill += (bill * (tax / 100.0));
    bill += (bill * (tip / 100.0));

    bill /= 2;

    return bill;
}

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[+] Touching_Grass@lemmy.world -13 points 1 year ago* (last edited 1 year ago) (12 children)

This answer makes me so angry like revisiting trauma from learning programming. I just remember asking questions early on and getting answers more confusing that are even harder to parse

[–] ono@lemmy.ca 9 points 1 year ago* (last edited 1 year ago) (5 children)

This answer makes me so angry like revisiting trauma from learning programming.

If you bothered to read the documentation, which exists in abundance on the web, in many books, in the built-in manuals of various operating systems and dev tools, and which I also linked in my answer, you would see a full explanation with clear examples.

But you can't be bothered with any of that, and instead expect other people to spend their time writing custom tutorials just for you?

Your anger is misplaced. Please consider taking a walk.

I just remember asking questions early on and getting answers more confusing that are even harder to parse

When you ask people questions about their field of knowledge, and they don't know you, it's reasonable for their answers to assume you know the rudimentary basics. (Just as it would be reasonable for a fourth-year group to assume a that a stranger asking them questions has at least taken the first-year class.) Asking beyond your level of experience is not necessarily bad, but you should be ready to describe what you don't understand about the answer, so that people can either elaborate with a helpful level of detail or send you to a forum more appropriate for your needs. For example:

!learn_programming@programming.dev

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