mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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36 lines
951 B
Go
36 lines
951 B
Go
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// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import "fmt"
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// Fibonacci returns the n-th fibonacci number.
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func Fibonacci(n uint) (uint64, error) {
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if n <= 1 {
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return uint64(n), nil
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}
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if n > 93 {
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return 0, fmt.Errorf("unsupported fibonacci number %d: too large", n)
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}
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var n2, n1 uint64 = 0, 1
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for i := uint(2); i < n; i++ {
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n2, n1 = n1, n1+n2
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}
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return n2 + n1, nil
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}
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