Question

is there a way that I can make this work? Or do I need to use separate files?

#include <iostream>                                                     // Necessary 
using namespace std;
#define long double mMaxOf2(long double min, long double max)
#define long double mMaxOf3(long double Min, long double Max, long double Mid)\
{\
     mMaxOf2(mMaxOf2((Min), (Mid), (Max)));\
}

int main()
{
    double primary;
    double secondary;
    double tertiary;
    cout << "Please enter three numbers: ";
    cin >> primary >> secondary >> tertiary;
    cout << "The maximum of " << primary << " " << secondary << " " << tertiary;
    cout << " using mMaxOf3 is " << (mMaxOf3(primary, secondary, tertiary));


    return 0;
}

Problem lies with mMaxOf3, it isn’t declared… Hmm maybe I need the prototype.

Answer 1

Multi line macros require a \ character at the end of each line (except the last).