+ 5
What does this mean? (double) It's the same things? I know the answer to this, but what role "double"? Double-precision number?
Console. WriteLine(-b/(2*(double)a)); or Console. WriteLine(-(double)b/(2*a)); //thx☺️
2 Respuestas
+ 5
(dataType) is an operator that will cast (cast is a fancy word for convert) whatever is to the right of it to that type.
For example,
float a = 5.5;
int b = (int)a;
A is being casted to an int, making b equal to 5.
One more example:
float d = 5.5;
int e = (int)(d + 2 * 2);
e will cast (5.5 + 2 * 2) to an int.
Making e: 5.5 + 4 = 9.5 = 9.
In your example, we are casting to a double. That way the result can have decimals with high precision.
+ 4
Precision is the main difference.
Float - 7 digits (32 bit)
Double-15-16 digits (64 bit)
Decimal -28-29 significant digits (128 bit)