// determine if a number is positive
#include <iostream>
#include <math.h>
#include <string.h>
using namespace std;

const double x=5;

const char s1[30] = "x is ";
const char s_positive[] = "positive";
const char s_negative[] = "negative";
int main()
{
  char response[30];

  strcpy( response, s1 ); // copy s1 to response
  if (x>=0){
    strcat( response, s_positive ); // add s_positive to response
  }else{
    strcat( response, s_negative ); // add s_negative to response
  }

  cout << response << endl;
}