Separate slice percentage.

main.go

package main

import (
	"fmt"
	"math"
)

func main() {
	a := 51
	b := 35
	c := 32
	total := float64(a) + float64(b) + float64(c)
	//total :=a+b+c

	//if a+b+c != 100 {
	//	log.Fatal("a + b + c not 100")
	//}

	s := make([]int, 2461)
	for i := 0; i < len(s); i++ {
		s[i] = i + 1
	}

	l := float64(len(s))

	fmt.Println("----------")
	fmt.Println(float64(a) / total)
	fmt.Println(l * float64(a) / total)
	fmt.Println(int(l * float64(a) / total))
	fmt.Println(float64(b) / total)
	fmt.Println(l * float64(b) / total)
	fmt.Println(int(l * float64(b) / total))
	fmt.Println(float64(c) / total)
	fmt.Println(l * float64(c) / total)
	fmt.Println(int(l * float64(c) / total))
	fmt.Println("----------")

	fmt.Println(int(l*float64(a)/100) + int(l*float64(b)/100) + int(l*float64(c)/100))
	fmt.Println("----------")

	fmt.Println(len(s))
	as, s := s[:int(math.Round(l*float64(a)/total))], s[int(math.Round(l*float64(a)/total)):]
	fmt.Println(len(s))
	bs, s := s[:int(math.Round(l*float64(b)/total))], s[int(math.Round(l*float64(b)/total)):]
	fmt.Println(len(s))
	cs, s := s[:int(math.Round(l*float64(c)/total))], s[int(math.Round(l*float64(c)/total)):]
	fmt.Println(len(s))
	fmt.Println("----------")

	fmt.Println(s)
	fmt.Println(as)
	fmt.Println(bs)
	fmt.Println(cs)
}