Testing Challenge #4 - generate testing data

challenge4.go

package main

/*

What to do

Create 5 valid data input for the specification below.

Enter them 1 at a time until you reach 5.

This challenges emphasizes the skill required to create your own test data.

Specification

Each person born in Romania receives a unique identification number.

The number has 13 digits, e.g. 1234567890123

What the digits represent:

    First digit – the gender: male or female
        1 or 2 – born between 1 January 1900 and 31 December 1999
        3 or 4 - born between 1 January 1800 and 31 December 1899
        5 or 6 - born between 1 January 2000 and 31 December 2099
        7 or 8 – Foreign residents in Romania.
        9 - For non-residents
    Next 2 digits – last 2 digits of the year of birth (e.g. born in 1980 then it will 80 )
    Next 2 digits – month of birth (01 to 12)
    Next 2 digits - date of birth (01 to 31 depending on the month of birth)
    Next 2 digits – area code (valid codes are 01 to 52)
    Next 3 digits – order number
    Last digit control number is created by:
        Take the first 12 numbers of the CNP: 123456789012 and multiply each number with the corresponding position number from this string: 279146358279 like: 1 * 2 + 2 * 7 + 3 * 9 + 4 * 1+…..+ 12 * 9= X
        You divide X by 11 the rest obtained if it is 10 then the last digit is 1 otherwise it equals the rest obtained


*/
import (
	"fmt"
	"math/rand"
	"strconv"
)



func cnum(s string) string {

	var NUMS = [12]int{ 2, 7, 9, 1, 4, 6, 3, 5, 8, 2, 7, 9}
	//    Take the first 12 numbers of the CNP: 123456789012 and multiply each number with the corresponding position number from this string:
	//		279146358279 like: 1 * 2 + 2 * 7 + 3 * 9 + 4 * 1+…..+ 12 * 9= X
	//    You divide X by 11 the rest obtained if it is 10 then the last digit is 1 otherwise it equals the rest obtained
	r := 0
	for i, ch := range s {
		k := int(ch) - 48
		if (k < 0) || (k > 9) {
			continue
		}
		r += NUMS[i] * k
//		fmt.Println(i+1, "*" , k, "=", (i + 1) * k, "/", r)
	}
	k := r % 11
	cnt := k
	if cnt == 10 {
		cnt = 1
	}
//	fmt.Println(r, k, cnt)
	return strconv.Itoa(cnt)
}

func randrange(a, b, z int) string {
	if a > b {
		b, a = a, b
	}
	k := rand.Intn(b - a + 1) + a
	if z > 0 {
		return fmt.Sprintf("%0"+strconv.Itoa(z)+"d", k)
	}
	return strconv.Itoa(k)
}

func makeiud() string {
	// First digit – the gender: male or female
	gender :=  randrange(1, 2, 0)
	// last 2 digits of the year of birth
	year := randrange(80, 99, 2)
	// month of birth (01 to 12)
	month := randrange(1, 12, 2)
	// date of birth (01 to 31 depending on the month of birth)
	day := randrange(1, 29, 2)
	// Next 2 digits – area code (valid codes are 01 to 52)
	area := randrange(1, 52, 2)
	// Next 3 digits – order number
	order := randrange(1, 999, 3)
	//
//	fmt.Println(gender, year, month, day, area, order)
	//
	return gender + year + month + day + area + order
}

func test(s string) {
	fmt.Println(s + cnum(s))
//	fmt.Println("---------------------------")
}

func main() {
	rand.Seed(42);
	const COUNT = 7
//	test("187082443706")
	for i := 1; i <= COUNT; i++ {
		test(makeiud())
	}
}