void ToolsRhoEstimator::on_valueChanged(double newval) {
newval++; // hack to avoid the "unused parameter" g++ warning.
// scrape the field values, convert to metric if needed.
double temp = tempSpinBox->value();
double press = pressSpinBox->value();
double dewp = dewpSpinBox->value();
if (impBut->isChecked()) {
// yup, convert to metric.
temp = fahrenheit_to_celsius(temp);
press = inchesmercury_to_hectopascals(press);
dewp = fahrenheit_to_celsius(dewp);
}
// calculate rho, in (kg/m^3)
double rho_met = calculate_rho(temp, press, dewp);
// calculate rho in imperial units.
double rho_imp = rho_met_to_imp(rho_met);
// display the calculated Rho's.
std::stringstream ss_met, ss_imp;
ss_met.precision(6);
ss_met << rho_met;
txtRhoMet->setText(tr(ss_met.str().c_str()));
ss_imp.precision(6);
ss_imp << rho_imp;
txtRhoImp->setText(tr(ss_imp.str().c_str()));
}
void ToolsRhoEstimator::on_radio_toggled(bool checked) {
checked = true; // hack to avoid the "unused parameter" g++ warning
if (impBut->isChecked()) {
// we just changed from metric --> imperial, so relabel and do the
// field conversions for the user.
tempSpinBox->setValue(celsius_to_fahrenheit(tempSpinBox->value()));
tempLabel->setText(tr("Temperature (F):"));
pressSpinBox->setValue(
hectopascals_to_inchesmercury(pressSpinBox->value()));
pressLabel->setText(tr("Air Pressure (inHg):"));
dewpSpinBox->setValue(celsius_to_fahrenheit(dewpSpinBox->value()));
dewpLabel->setText(tr("Dewpoint (F):"));
} else {
// we just changed from imperial --> metric, so relabel and do the
// field conversions for the user.
tempSpinBox->setValue(fahrenheit_to_celsius(tempSpinBox->value()));
tempLabel->setText(tr("Temperature (C):"));
pressSpinBox->setValue(
inchesmercury_to_hectopascals(pressSpinBox->value()));
pressLabel->setText(tr("Air Pressure (hPa):"));
dewpSpinBox->setValue(fahrenheit_to_celsius(dewpSpinBox->value()));
dewpLabel->setText(tr("Dewpoint (C):"));
}
// Relay the "something has changed" signal to
// on_valueChanged(double).
this->on_valueChanged(0.0);
}
int main(int argc, char *argv[], char **envp)
{
float start = 100.0, end = 600.0, step = 50.0, fahr;
float temp;
char garbage[80];
int rv = 0;
start = ask_for_float("give me a start: ");
end = ask_for_float("give me an end: ");
step = ask_for_float("give me a step size: ");
if ( start > end && step > 0 ) {
step = -step; /* negative step */
}
/*
a <= b <=> c*a <= c*b
-a >= -b
a <= b
*/
for(fahr = start; step*fahr <= step*end; fahr = fahr + step) {
printf("%g°F => %5.1f°C\n", fahr, fahrenheit_to_celsius(fahr));
}
}
int main(void)
{
int fahrenheit;
for (fahrenheit = 0; fahrenheit <= 300; fahrenheit = fahrenheit + 20)
printf("%3d %6.1f\n", fahrenheit, fahrenheit_to_celsius(fahrenheit));
return 0;
}
int main() {
float fahrenheit;
float lower, upper, step_size;
lower = 0;
upper = 300;
step_size = 20;
for (fahrenheit = lower; fahrenheit <= upper; fahrenheit += step_size) {
printf("%3.0f F = %6.1f C\n", fahrenheit, fahrenheit_to_celsius(fahrenheit));
}
return 0;
}
int main()
{
int result = plus_one(5);
printf("%d\n", result);
char sign = get_sign(-5);
printf("Sign of %d is %c\n", -5, sign);
printf("Celius: %.2f\n", fahrenheit_to_celsius(44));
printf("%.2f^%d = %.2f\n", 3.0, 3, power(3.0, 3));
double triangleArea = calc_triangle_area(3, 4);
printf("Area: %.2f", triangleArea);
return (EXIT_SUCCESS);
}
