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;
}
  • steersman2484@sh.itjust.works
    23·
    1 year ago

    Please put your code between tripple backticks in a seperate line above an below your code. Single backticks are only for inline code like this.

    To answer your question, the %.2f means it should only print two digits after the decimal point.

    You can also use some other variations like this:

    • %2f print the number at least 2 characters wide
    • %5.2 print the number at least 5 characters wide with a precision of two digits after the decimal point
    • %05.2 the same as above, but fill leading digits with zeros

    This is just formatting, play a bit around with it and you will get it.

    • unalivejoy@lemm.eeEnglish
      8·
      1 year ago

      Example with pi.

      #define PI 3.1415926

int main() {
  printf("%.2f", PI); // prints 3.14
  return 0;
}
  • AlmightySnoo 🐢🇮🇱🇺🇦@lemmy.world
    4·
    1 year ago

    If you want multi-line code, you need to put it like this:

    For these kinds of questions, your best friend is the documentation. In particular, a man 'printf(3)' yields:

    Format of the format string

    The format string is a character string, beginning and ending in its initial shift state, if any. The format string is composed of zero or more directives: ordinary characters (not %), which are copied unchanged to the output stream; and conversion specifications, each of which results in fetching zero or more subsequent arguments. Each conversion specification is introduced by the character %, and ends with a conversion specifier. In between there may be (in this order) zero or more flags, an optional minimum field width, an optional precision and an optional length modifier.

    The overall syntax of a conversion specification is:

    %[$][flags][width][.precision][length modifier]conversion

  • atheken@programming.dev
    41·
    1 year ago

    This is the kind of thing that writing a unit test or a simple console app to try it yourself would be a lot more educational than posting a question online.

    And much faster.

  • BougieBirdie@lemmy.blahaj.zone
    2·
    1 year ago

    %.2f will format your number rounded to two decimal places. So if you had 1 / 3 it would come out as 0.33 instead of 0.333333

    % is the placeholder for the value

    .2 tells it ‘two spaces after the decimal’

    f tells it that the placeholder is a float