FAQ: Operators: Lesson - Mathematical Operations

This community-built FAQ covers the “Mathematical Operations” exercise from the lesson “Operators: Lesson”.

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I had an issue with the last instruction.
My first thought was to use totalSalesValue = (booksSold * bookCost) / 2; to output the cut, and it ran as intended, yet the instruction told me that I was doing it wrong. I shortly appeased it afterwards.
A bit odd to see only one answer as correct for something like this.

2 Likes

what was your solution? my following code is throwing an error :frowning:

#include <stdio.h>

int main() {
  
  // Variables set for you, do not change here
  int booksSold = 200;
  double bookCost = 9.99;
  double totalSalesValue;

  // Make your changes here
  totalSalesValue = booksSold * bookCost / 2;
  totalSalesValue = totalSalesValue * .5;

  // Output logic, no need to change this
  printf("You sold %d books and your take home was $%.2f\n", booksSold, totalSalesValue);
}

This was my solution.

#include <stdio.h>

int main() {
  
  // Variables set for you, do not change here
  int booksSold = 100 + 200;
  double bookCost = 9.99;
  double totalSalesValue;

  // Make your changes here
totalSalesValue = (booksSold * bookCost);
totalSalesValue = totalSalesValue / 2;
  // Output logic, no need to change this
  printf("You sold %d books and your take home was $%.2f\n", booksSold, totalSalesValue);
}

No idea how you get an error with your code, it works on my side.
But if it’s not letting you through to the next guide, I know why.
For one, it says you sold 200 MORE books, so it would be 100 + 200 instead of 200.
Plus, you simulated the publisher’s cut twice.