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package cap3
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// Ex1 例题1
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// 求1/1! - 1/3! + 1/5! - 1/7! + ... + (-1)^(n+1)/(2n-1)!
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func Ex1(n int) float64 {
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sum, fab := 0.0, uint64(1)
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for i := 1; i <= n; i++ {
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fab *= 2*uint64(i) + 1
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if i%2 == 0 {
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sum += -1.0 / float64(fab)
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} else {
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sum += 1.0 / float64(fab)
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}
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}
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return sum
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}
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