02. Report System

package main

import (
    "fmt"
    "strconv"
)

func main() {
    var neededSum, sumTransaction int
    fmt.Scanln(&neededSum)

    var cashSum = 0
    var cardSum = 0
    var cashCount = 0
    var cardCount = 0

    var input string
    fmt.Scanln(&input)

    for i := 0; neededSum > 0 && input != "End"; i++ {
        sumTransaction, _ = strconv.Atoi(input)
        if i % 2 == 0 && sumTransaction > 0 && sumTransaction <= 100 || i % 2 == 1 && sumTransaction >= 10 {
            fmt.Println("Product sold!")
            neededSum -= sumTransaction
            if i % 2 == 0 {
            cashSum += sumTransaction
            cashCount++
            } else {
               cardSum += sumTransaction
               cardCount++
            }
        } else {
           fmt.Println("Error in transaction!")
        }
        fmt.Scanln(&input)
    }

    if input == "End" {
        fmt.Println("Failed to collect required money for charity.")
    } else {
        fmt.Printf("Average CS: %.2f\nAverage CC: %.2f\n", float64(cashSum) / float64(cashCount), float64(cardSum) / float64(cardCount))
    }
}