Function returning incorrect value

I'm having a little trouble with this block of code:

Code:

---

int sphere()
{
        float radius_2, volume;

        printf( "Radius: " );
        scanf( "%f", &radius_2 );
       
        volume = ( 4 / 3 ) * PI * pow( radius_2, 3 );
       
        printf( "Volume = %f\n", volume );
       
        volume_menu();
       
        return 0;
}

---

PI is defined at the beginning of the program as 3.14159 using:

Code:

---

#define PI 3.14159

---

My problem is that this function is returning 25.132721 as as volume instead of the correct value of ~33.49. I've narrowed the problem down to the 'volume = ( 4 / 3 ) * PI * pow( radius_2, 3 );' statement; specifically the '( 4 / 3 )' portion of the statement. It seems to me that it is returning 1.0 as 4 / 3 instead of the actual value - even though volume is declared type float.

Thanks for any help!

You should express it as "(4.0 / 3.0)", or even "(4.0 / 3)" -- that way, you're getting a floating point result rather than an integer result.

Integer division bud.

4 / 3 = 1
4 / 3.0 = 1.3333333...

Also format your floats.

Code:

---

volume = ( 4 / 3.0 ) * PI * pow( radius_2, 3 );
printf( "Volume = %.3f\n", volume );

---

EDIT: Beaten to the punch... :(
I guess that's why he's a Senior Software Engineer and I'm... well I'm just a student.

Thanks a lot guys!