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Topic: the dumbest question ever (Read 299 times) |
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lunetta
 
 
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the dumbest question ever
« on: Dec 4th, 2004, 7:14pm » |
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If I depend on my programming skills for surviving... sweet old Darwin laws may apply.
check this complex code:
float n;
void setup() {
n=0; }
void loop() {
n= n+(0.5);
println(n);
}
works, right?
now check this one:
float n;
void setup() {
n=0; }
void loop() {
n= n+(1/2);
println(n);
}
It doesn't. Returns only zeros. Why?
this is me:
void conceptual() {
float understanding = 0;
if (understanding > 0) { return miracle; }
}
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TomC
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Re: the dumbest question ever
« Reply #1 on: Dec 4th, 2004, 7:50pm » |
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1 and 2 are integer constants (ints).
Integer division in Java (and lots of other languages) will throw away the remainder. 1/2 doesn't represent a half, it represents integer division of 1 by 2. 1 divided by 2 is 0, remainder 0.5. But the 0.5 gets thrown away.
In this case, 1/2 will be calculated by the compiler as 0, and then when the code is run each time loop is called it will add 0 onto n.
If you use 1.0/2.0, then it will use float division and give you the answer you expect.
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lunetta
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Re: the dumbest question ever
« Reply #2 on: Dec 4th, 2004, 8:06pm » |
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return miracle;
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