Why does the first rounding statement work for me and the second does not?
//Esta Funciona
decimal discountAmount = Math.Round(subTotal * discountPercent, 2);
//Esta no funciona
decimal discountAmount = subTotal * discountPercent;
Math.Round(discountAmount, 2);
Both work, what happens is that one is assigned, the other is not.
When doing:
Math.Round(...); // Donde los puntos son tu expresion aritmetica o valor.
You are not assigning the return value of Math.Round(...) , you only make the operation and nothing else happens afterwards.
But when doing:
decimal t = Math.Round(...); // Lo mismo con los puntos...
Console.WriteLine(t); // Debe de darte el round del valor.
You are assigning the result of the function Math.Round in variable t (In my case) .
Functions have a return value, that value is assignable to a variable or used in an expression, example:
int dos() {
return 2; // Devuelve 2 a quien me llame.
}
If I do:
decimal MiDecimal = Math.Round((dos() * 8.25) + 0.05, 1);
That is summarized to:
decimal MiDecimal = Math.Round((2 * 8.25) + 0.05, 1);
And carry out the operation, where 16.5 is the value of MiDecimal .