Java Example What Does Tis Do?

[iccaros]

while (X<0)

x += sTwoPI;

)

I have never seen += or the opisite -=

thanks

[shanenin]

it appears to be a counter. it will keep looping until the value of x is less then 0

I think these are equivailant(forgot my syntax, I don't know any java)

x += sTwoPI

x = x + sTwoPI

I will use python for an example. Lets say you want somthing to loop 5 times, each time it will print the value of "x". Once the value of x hits 5 it will stop

x = 0
while x < 5:
  x = x + 1
  print x

this is the same thing using the other syntax

x = 0
while x < 5:
  x += 1
  print x

My programming skills are so forgotten, I had to look up the syntax to do this.

Edited October 20, 2006 by shanenin

[iccaros]

so your saying its the same as doing a x++?

[shanenin]

to be honest, I have never seen that syntax. Is that java?

[jcl]

shanenin is correct. Those are compound assignment operators. x op= y is equivalent to x = x op y (except that x is evaluated once instead twice).

Edited October 21, 2006 by jcl

[iccaros]

to be honest, I have never seen that syntax. Is that java?

c++ java, c# and VB and C

X++ would incrament X by one , its the same as X = X + 1

X-- is the opisite

[shanenin]

cool :-)

[iccaros]

so since my entier class is as such

public static double fixAzimuth_02PI (double x)

while (x < 0)

{

x += sTwoPI;

}

while (x > sTwoPI)

{

x -= sTwoPi;

}

return x;

}

private static final double sTwoPi = 2.0 * Math.PI;

so I gather this is keeping x between 0 and 2*PI

[jcl]

X++ would incrament X by one , its the same as X = X + 1

Not quite the same. x = x + 1 increments x and returns the new value, whereas x++ increments x and returns the previous value.

so I gather this is keeping x between 0 and 2*PI

Looks like but I'm not sure it's correct. Seem like the angle θ should be normalized to 0 <= θ < 2π rather than 0 < θ <= 2π.

Edited October 21, 2006 by jcl

[iccaros]

you are correct, ++x would incrament and send incramented while X++ incarments and sends prior but x is still incramented. so its the same as ++x