rounding function question

[cnoobie]

hi all, i was wondering how i could create my owen rounding fnction, like without using any libraries such as setprecision and iomanip.

basically there is a cout command with two data types (double x(number), int n(amount of digits needed to be rounded)

so then i created

double round(double x, int n)
{
return x;
}

does anyone know how this program would take the number or digits of int n and round the x number to that amount of digits without using a library?

[arne]

hi all, i was wondering how i could create my owen rounding fnction, like without using any libraries such as setprecision and iomanip.

basically there is a cout command with two data types (double x(number), int n(amount of digits needed to be rounded)

so then i created

double round(double x, int n)
{
return x;
}

does anyone know how this program would take the number or digits of int n and round the x number to that amount of digits without using a library?

It is not really clear to me what your round function will do when called with
x=125.678 and n=2.

120.00 (only the 2 leading digits, discard the rest)
130.00 (only the 2 leading digits, but rounded with the next one)
125.67 (preserve up to the first 2 digits after the comma)
125.68 (round with the digits n+1 after the comma)

Can you please clarify?