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Re: Where does Modulus fit in with PEMDAS?

Nov 9th, 2008

When in doubt, write a program! It's faster and more accurate than research. I did this on Dev C++, but is it a reasonable assumption that it's the same everywhere?

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
using namespace std;
 
int main ()
{
    int a = 8 * 9 % 5;
    cout << a << endl;
    a = 10 % 3 * 2;
    cout << a << endl;
    cin.get ();
    return 0;
}
#include <iostream>
using namespace std;

int main ()
{
    int a = 8 * 9 % 5;
    cout << a << endl;
    a = 10 % 3 * 2;
    cout << a << endl;
    cin.get ();
    return 0;
}

Answers are 2 and 2, so it looks like * and % have equal precedence, so left takes precedence over right, as with multiply and divide. Thus you need another choice in your poll. It's one of the reasons I never liked "PEMDAS". If all you remember is the acronym, you always multiply before dividing, which is wrong, and you always add before subtracting, which is also wrong. So I think it's:

PE[MD%][AS]

Operations inside the brackets have the same precedence.

Last edited by VernonDozier; Nov 9th, 2008 at 4:09 am.