main.cpp

C++ Source code from a tutorial

#include <iostream>
#include <stdlib.h>

using namespace std;

template <typename T> T AbsoluteValue(T x) {
    cout << "(using first)" << endl;
    if (x >= 0)
        return x;
    else
        return -x;
}

template <typename T> T AbsoluteValue(T *x) {
    cout << "(using second)" << endl;
    if (*x >= 0)
        return *x;
    else
        return -(*x);
}
/*
int main(int argc, char *argv[])
{
    int n = -3;
    cout << AbsoluteValue<int>(n) << endl;
    
    float *xptr = new float(-4.5);
    cout << AbsoluteValue<float>(xptr) << endl;
    
    cout << AbsoluteValue<float>(10.5) << endl;
    
    system("PAUSE");	
    return 0;
}
*/

// Trick
int main(int argc, char *argv[])
{
    int n = -3;
    cout << AbsoluteValue(n) << endl;
    
    float *xptr = new float(-4.5);
    cout << AbsoluteValue(xptr) << endl;
    
    cout << AbsoluteValue(10.5) << endl;
    
    system("PAUSE");	
    return 0;
}