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https://github.com/fluencelabs/wasmer
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37 lines
912 B
C
37 lines
912 B
C
/*
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* Copyright 2016 The Emscripten Authors. All rights reserved.
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* Emscripten is available under two separate licenses, the MIT license and the
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* University of Illinois/NCSA Open Source License. Both these licenses can be
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* found in the LICENSE file.
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*/
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#include <stdio.h>
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#include <math.h>
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#include <assert.h>
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static const double tol = 1e-16;
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void test_value(double value) {
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int exponent;
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double x = frexp(value, &exponent);
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double expected = x * pow(2.0, exponent);
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printf("%f=%f*2^%d\n", value, x, exponent);
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assert(fabs(expected - value) < tol);
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assert(x == 0 || (fabs(x) >= 5e-1 && fabs(x) < 1)); // x has a magnitude in
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// the interval [1/2, 1)
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}
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int main() {
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test_value(0);
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test_value(100.1);
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test_value(-100.1);
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test_value(.5);
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test_value(-.5);
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test_value(1 - 1e-16);
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test_value(-(1 - 1e-16));
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return 0;
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}
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