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Strange behavior in XCode, not exhibited in Dev-C++

Subject: Strange behavior in XCode, not exhibited in Dev-C++
From: Richard Rehl <email@hidden>
Date: Thu, 8 Feb 2007 17:33:14 -0500
Delivered-to: email@hidden
Delivered-to: email@hidden

I'm having issues with the simple inclusion/exclusion of a single

#include <iostream> statement

in a source file which is strictly dedicated to defining two functions for calculating the column widths of a series of integers and their squares. If the statement is excluded, the calculation of the width of the integers column is incorrect; when it's included, the calculation is correct.

There should be absolutely no reason to include the statement in this file as all output statements are handled from the main function.

As you can guess, I'm not very experienced at this. I've had to get a POS PC for some coursework that I'm taking, so tried to compile the same project in Dev-C++. The above behavior is not exhibited in that environment, so I'm mystified. If anyone's interested, here's the code:

main.cpp

#include <iostream>
#include <cmath>
#include <iomanip>
#include "FindColWidths.h"

using std::endl;
using std::cout;
using std::pow;
using std::fabs;
using std::setw;
using std::setprecision;
using std::streamsize;

int main () {
    double start = -10;
    double end = 1001;
    double absoluteLargest = fabs(start) < fabs(end) ? end : start;
    cout << "Absolute Largest: " << absoluteLargest << endl;
    int rootWidth = findRootWidth(absoluteLargest, 1);
    cout << "RootWidth: " << rootWidth << endl;
    int sqrWidth = findSqrWidth(absoluteLargest, 1);
    streamsize prec = cout.precision();
    cout << setprecision(sqrWidth);
    for (start; start < end; start++) {
        cout << setw(rootWidth) << start
             << setw(sqrWidth) << pow(start, 2)
             << endl;
    }
    cout.precision(prec);
    return 0;
}

FindColWidths.cpp:

#include "FindColWidths.h" #include <cmath> //#include <iostream> //........................Here is the line in question........................... using std::fabs; using std::pow;

int findRootWidth(double i, double width) {
    if (fabs(i) < pow(10, width)) {
        return int(width) + 2;
    }
    else {
        return findRootWidth(i, width + 1);
    }
}

int findSqrWidth(double i, double width){
    if (pow(i, 2) < pow(10, width)) {
        return int(width) + 1;
    }
    else {
        return findSqrWidth(i, width + 1);
    }
}

FindColWidths.h:


#ifndef GUARD_FindColWidths_h
#define GUARD_FindColWidths_h

int findRootWidth(double, double);

int findSqrWidth(double, double);

#endif

Sample output logs:  With #include <iostream> enabled:

Absolute Largest: 1001
RootWidth: 6
   -10     100
    -9      81

With #include <iostream> disabled:

Absolute Largest: 1001
RootWidth: 3
-10     100
-9      81

TIA
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