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Confusion in Data type!

P: 2
Hi Everybody,

help me to clear the doubt.

double x = 1125899973951488.0;
float y,z,r;
y = x+1;
z = x-1;
r = y-z;

The actual result should be 2.0.But it compiles to give the result 134217728.000000. Whats happening there?

Thanks in advance,

May 24 '07 #1
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Expert Mod 5K+
P: 9,197
You are mixing double and float. float is smaller than double so you lose data due to rounding.

If you use double throughout, you will get your expected result.

In fact, let me say that unless you have a real technical reason for doing otherwise, a reason that you can write down, always use double.

float is a carryover from days of yore when machines had very small memories.
May 24 '07 #2

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