some book code

I am using a book assigned for a class which seems to mix C style and C++ style code and calls it C++ , for ex. the following

Code:

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

struct point { float x; float y; };

float randFloat()
  { return 1.0*rand()/RAND_MAX; }
int main(int argc, char *argv[])
 { float d = atof(argv[2]);
  int i, cnt = 0, N = atoi(argv[1]);
  point *a = new point[N];
  for (i = 0; i < N; i++)
    { a[i].x = randFloat(); a[i].y = randFloat(); }
  for (i = 0; i < N; i++)
    for (int j = i+1; j < N; j++)
      if (distance(a[i], a[j]) < d) cnt++;
  cout << cnt << " pairs within " << d << endl;
 }

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does this "iostream.h" come with any compiler standard? I get file not found, only the regular <iostream> exists on my computer, using gcc ( i think )

If I change it to <iostream> , as I *think* it should be, then of course I get the missing namespace error for cout ... ok then if I add the using namespace std statement that he might (?) have left out ... then I get a conflict with the distance function already being defined in std...

My question is, is it possible that this code actually compiled on SOME major compiler that I don't know of?

iostream.h was used before C++ got standardised. But that was in 1998.

So yeah, it's obsolete now.

> I am using a book assigned for a class which seems to mix C style and C++ style code and calls it C++
I call it road-kill.
There are unfortunately just as many bad books as there are bad teachers.

The first 3 includes should be

Code:

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#include <cmath>
#include <iostream>
#include <cstdlib>

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Pre-ISO C++ headers lose the .h
ISO-C headers lose the .h, and begin with a 'c'

Finally for ease of porting old code (or laziness in writing new code), you add

Code:

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using namespace std;

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