Question :A Defected meter is given with missing number 4
from it's rim.WAP that convert the wrong reading into right one.
Example:
input 100
output 81
hint: (41,24,34,40-49,54,64,74,84,94)is missed.
package vinsol;
/* count 1,2,3,5,6,7,8,9,10============9
* 11,12,13,15,16,17,18,19,20====9
* 21,22,23,25,26,27,28,29,30===9
* 31,32,33,35,36,37,38,39======8
* 50==1
* cases--miss ---correct value
* 10 ----1-----9
* 100----19-----81
* 1000---19*9+99=270---770
* 10000--270*9 +999=3429---6571
* there is pattern ..use this pattern with care.
*note: so input can never be 4,44,444
*/
public class DefectedMeter {
static int correctMe(int num)// correct me like you do.
{
if (num < 4)
return num;
else if (num >= 4 && num <= 10)
return num - 1;// like 9
int n = 10, p = 9;
while(true) {
if (num >= (n) && num <= (n * 3 + p))
if (num % n <= 3)
return num - ((num / n) * (correctMe(n / 10)) + n * (0));
else
return num
- ((num / n + 1) * (correctMe(n / 10)) + n * (0));
if (num > (n * 3 + p) && num <= (n * 10))
if (num % n <= 3)
return num
- ((num / n - 1) * (correctMe(n / 10)) + n * (1));
else
return num - ((num / n) * (correctMe(n / 10)) + n * (1));
p = n + p;
n *= 10;
}
}
public static void main(String[] args) {
System.out.println(correctMe(10));// 9(4)
System.out.println(correctMe(13));// 12(4)
System.out.println(correctMe(15));// 13(4,14)
System.out.println(correctMe(20));// 18(4,14)
System.out.println(correctMe(30));// 27(4,14,24)
System.out.println(correctMe(33));// 30(4,14,24)
System.out.println(correctMe(35));// 31(4,14,24)
System.out.println(correctMe(39));// 35(4,14,24,34)
System.out.println(correctMe(50));// 36(4,14,24,34,40-49)
System.out.println(correctMe(53));// 39(4,14,24,34,40-49)
System.out.println(correctMe(55));// 40
System.out.println(correctMe(100));// 4,14,24,34,40-49,54,64,74,84,94
System.out.println(correctMe(1000));
System.out.println(correctMe(10000));
System.out.println(correctMe(100000));
}
}
OUTPUT 9 12 13 18 27 30 31 35 36 39 40 81 819 8271 82629