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Diffstat (limited to 'third_party/rust/cubeb-sys/libcubeb/googletest/samples/sample1.cc')
-rw-r--r-- | third_party/rust/cubeb-sys/libcubeb/googletest/samples/sample1.cc | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/third_party/rust/cubeb-sys/libcubeb/googletest/samples/sample1.cc b/third_party/rust/cubeb-sys/libcubeb/googletest/samples/sample1.cc new file mode 100644 index 0000000000..f171e2609d --- /dev/null +++ b/third_party/rust/cubeb-sys/libcubeb/googletest/samples/sample1.cc @@ -0,0 +1,68 @@ +// Copyright 2005, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// A sample program demonstrating using Google C++ testing framework. +// +// Author: wan@google.com (Zhanyong Wan) + +#include "sample1.h" + +// Returns n! (the factorial of n). For negative n, n! is defined to be 1. +int Factorial(int n) { + int result = 1; + for (int i = 1; i <= n; i++) { + result *= i; + } + + return result; +} + +// Returns true iff n is a prime number. +bool IsPrime(int n) { + // Trivial case 1: small numbers + if (n <= 1) return false; + + // Trivial case 2: even numbers + if (n % 2 == 0) return n == 2; + + // Now, we have that n is odd and n >= 3. + + // Try to divide n by every odd number i, starting from 3 + for (int i = 3; ; i += 2) { + // We only have to try i up to the squre root of n + if (i > n/i) break; + + // Now, we have i <= n/i < n. + // If n is divisible by i, n is not prime. + if (n % i == 0) return false; + } + + // n has no integer factor in the range (1, n), and thus is prime. + return true; +} |