what should i pass to the perlin noise function?

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Whenever my noise function receives an integer, it returns 0.0. As a hack, I normalise the integer values to between 0 & 1 then pass these fractions, which seems to work. Should a 'proper' noise function behave like this? Hope that's clear... For example,
   x           f(x) , x=0...1
0.000000        0.000000
0.062500        0.039380
0.125000        0.067071
0.187500        0.083820
0.250000        0.090620
0.312500        0.088686
0.375000        0.079434
0.437500        0.064462
0.500000        0.045532
0.562500        0.024545
0.625000        0.003522
0.687500        -0.015413
0.750000        -0.030058
0.812500        -0.038149
0.875000        -0.037384
0.937500        -0.025441
1.000000        0.000000

   x            f(x), x=0...8
0.000000        0.000000
0.250000        0.086903
0.500000        0.159596
0.750000        0.122567
1.000000        0.000000
1.250000        -0.053520
1.500000        -0.012297
1.750000        0.037380
2.000000        0.000000
2.250000        -0.159418
2.500000        -0.248051
2.750000        -0.166148
3.000000        0.000000
3.250000        0.065204
3.500000        0.032702
3.750000        -0.022282
4.000000        0.000000
4.250000        0.068747
4.500000        0.066424
4.750000        0.018433
5.000000        0.000000
5.250000        0.041893
5.500000        0.062273
5.750000        0.039840
6.000000        0.000000
6.250000        0.042292
6.500000        0.112942
6.750000        0.105945
7.000000        0.000000
7.250000        -0.038905
7.500000        0.030075
7.750000        0.078379
8.000000        0.000000


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I don't think that's the way a proper noise function should behave. I'd imagine it would force things be at extremes at regular intervals, which probably wouldn't look right. Doesn't necessarly mean it's wrong and won't work, but it's probably not right.

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I had this problem too... Didn't bother fixing it though, because I didn't really care much. I realise this doesn't help at you all. [ignore]

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