CS50x Coding Contest 2016 Practice - Temperature Converter

temperature.c

#include <math.h>
#include <stdio.h>
#include "cs50.h"

int main(void)
{
    double num;
    
    while (scanf("%lf", &num) == 1)
    {
        if (num < DBL_MAX || num >= -DBL_MAX)
        {
            double answer = num * 1.8 + 32;
            printf("%.1f\n", answer);
        }
        else
        {
            printf("Enter a number between %f and %f degrees Celsius.", -DBL_MAX, DBL_MAX);
            return 1;
        }    
    }
    return 0;
}