You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
18 lines
356 B
18 lines
356 B
8 months ago
|
package cap3
|
||
|
|
|
||
|
|
// Ex1 例题1
|
||
|
|
// 求1/1! - 1/3! + 1/5! - 1/7! + ... + (-1)^(n+1)/(2n-1)!
|
||
|
|
func Ex1(n int) float64 {
|
||
|
|
sum, fab := 0.0, uint64(1)
|
||
|
|
for i := 1; i <= n; i++ {
|
||
|
|
fab *= 2*uint64(i) + 1
|
||
|
|
if i%2 == 0 {
|
||
|
|
sum += -1.0 / float64(fab)
|
||
|
|
} else {
|
||
|
|
sum += 1.0 / float64(fab)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return sum
|
||
|
|
}
|