Go - 切片中正数、负数和零数元素的比率

arr := []int32{-2, -1, 0, 1, 2}

var negativenumber, positivenumber, zeronumber, totalnumber int32
var negativeratio, positiveratio, zeroratio float32

for i := 0; i < len(arr); i++ {
    totalnumber += 1
}

for i := 0; i < len(arr); i++ {
    if arr[i] < 0 {
        negativenumber += 1
    } else if arr[i] == 0 {
        zeronumber += 1
    } else if arr[i] > 0 {
        positivenumber += 1
    }
}

negativeratio = float32(negativenumber / totalnumber)
zeroratio = float32(zeronumber / totalnumber)
positiveratio = float32(positivenumber / totalnumber)

fmt.printf("total number: %d\n", totalnumber)

fmt.printf("positive number: %d\n", positivenumber)
fmt.printf("negative number: %d\n", negativenumber)
fmt.printf("zero number: %d\n", zeronumber)

fmt.printf("positive ratio: %f\n", positiveratio)
fmt.printf("negative ratio: %f\n", negativeratio)
fmt.printf("zero ratio: %f\n", zeroratio)

total number: 5
positive number: 2
negative number: 2
zero number: 1
positive ratio: 0.000000
negative ratio: 0.000000
zero ratio: 0.000000