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talhanasir
Member Posts: **13**

in C and C++

what is meaning of double-precision in the following question?

[blue]

Write a function that returns the double-precision area of a circle, given the double precision radius passed to it. The formula to calculate the radius of a circle is .

area = 3.14159 * radius * radius.

what will be the value of radius.? [/blue]

and what will be the value of radius in above question?

Talha Nasir

[blue]

Write a function that returns the double-precision area of a circle, given the double precision radius passed to it. The formula to calculate the radius of a circle is .

area = 3.14159 * radius * radius.

what will be the value of radius.? [/blue]

and what will be the value of radius in above question?

Talha Nasir

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## Comments

770✭✭✭: [blue]

: Write a function that returns the double-precision area of a circle, given the double precision radius passed to it. The formula to calculate the radius of a circle is .

:

: area = 3.14159 * radius * radius.

:

: what will be the value of radius.? [/blue]

:

: and what will be the value of radius in above question?

: Talha Nasir

:

:

[green]Use [italic]double[/italic] variables as opposed to [italic]float[/italic] for [italic]radius[/italic] and [italic]area[/italic]. How the heck do I know what the value of radius is going to be? I'm not clairvoyant/omniscient.[/green]

1,784: : [blue]

: : Write a function that returns the double-precision area of a circle, given the double precision radius passed to it. The formula to calculate the radius of a circle is .

: :

: : area = 3.14159 * radius * radius.

: :

: : what will be the value of radius.? [/blue]

: :

: : and what will be the value of radius in above question?

: : Talha Nasir

: :

: :

: How the heck do I know what the value of radius is going to be? I'm not clairvoyant/omniscient.[/green]

:

With some math it should be:

raduis = sqrt(area / 3.14159)

78{

return 3.14159 * radius * radius;

}[/CODE]

: what is meaning of double-precision in the following question?

: [blue]

: Write a function that returns the double-precision area of a circle, given the double precision radius passed to it. The formula to calculate the radius of a circle is .

:

: area = 3.14159 * radius * radius.

:

: what will be the value of radius.? [/blue]

:

: and what will be the value of radius in above question?

: Talha Nasir

:

:

64: {

: return 3.14159 * radius * radius;

: }[/CODE]

:

That's it! And to be exact, define and take

const double pi = 2.0 * acos(0.0); // 2*arccosine(0)

because pi is usually not defined in C libraries.

FDrache.