Простая ошибка C ++: «… необъявленная (сначала используйте эту функцию)»
Привет, ребята, я работаю над своей первой C ++ программой для школы. По какой-то причине я получаю следующую ошибку при попытке ее скомпилировать:
`truncate' undeclared (first use this function)
Полный источник:
#include
#include
using namespace std;
#define CENTIMETERS_IN_INCH 2.54
#define POUNDS_IN_KILOGRAM 2.2
int main() {
double feet, inches, centimeters, weight_in_kg, weight_in_lbs;
// get height in feet and inches
cout < "Enter height (feet): ";
cin >> feet;
cout < "Enter (inches): ";
cin >> inches;
// convert feet and inches into centimeters
centimeters = ((12 * feet) + inches) * CENTIMETERS_IN_INCH;
// round 2 decimal places and truncate
centimeters = truncate(centimeters);
printf("Someone that is %g' %g\" would be %g cm tall", feet, inches, centimeters);
// weights for bmi of 18.5
weight_in_kg = truncate(18.5 * centimeters);
weight_in_lbs = round(weight_in_kg * POUNDS_IN_KILOGRAM);
printf("18.5 BMI would correspond to about %g kg or %g lbs", weight_in_kg, weight_in_lbs);
// weights for bmi of 25
weight_in_kg = truncate(25 * centimeters);
weight_in_lbs = round(weight_in_kg * POUNDS_IN_KILOGRAM);
printf("25.0 BMI would correspond to about %g kg or %g lbs", weight_in_kg, weight_in_lbs);
// pause output
cin >> feet;
return 0;
}
// round result
double round(double d) {
return floor(d + 0.5);
}
// round and truncate to 1 decimal place
double truncate(double d) {
return round(double * 10) / 10;
}