void main() {
bmrFunction(weight:234,height:157,age:20);
}
String function3( String name){
return name;
}
void bmrFunction({required double weight,double? height, double? age}){
if(height == null && age == null){
height = 157;
age=20;
}
if(height != null && age == null){
age=20;
print(height);
print(age);
}
if(height != null && age != null){
print('all done');
}else{
print('no data');
}
double bmr = ( 88.362 + (13.397 * weight) + (4.799 * height!) - (5.677 * age!) ) * 1.725;
print(bmr);
}
// one of theme is enter age or height
// two of theme are entered
// check if age or height ar null
// resolve the error
void function1( String name, int last){
print(name);
print(last);
}
void function({required String firstName,String? last}){
String fullName ='';
print(last);
if(last == null)
{
fullName = firstName ;
}
else
{
fullName = firstName +' '+ last;
}
print(fullName);
}