Submit Chapter5.java with \" public static\" methods for solutions of these Exer

Question

Submit Chapter5.java with "public static" methods for solutions of these Exercises starting on page 381:

A. Exercise #18: digitSum, do not use String

write a method called digitSum that accepts an integer as a parameter and returns the sum of the digits of that number.

B. Exercise #20: digitRange, do not use String

write a mthod called digitRange that accepts a integer as a parameter and returns the range of values of its digits.

C. Write a method randColor() that returns a String which will randomly be one of the three primary colors ("red" or "yellow" or "blue").

D. Write a boolean method isValidHex that determines if a single String parameter contains only hexadecimal digits (0-9, a-f, A-F). For example, returns true, isValidHex("A932B") returns true, and isValidHex("anythingElse") returns false.   Your method cannot throw exceptions and must use an if-else block.

Explanation / Answer

public static int digitRange(int a){
   int min = Integer.MAX_VALUE;
   int max = 0,temp;
   if(a < 0)
       a = -a;
   while(a > 0){
       temp = a %10;
       if(temp > max)
           max = temp;
       if(temp < min)
           min = temp;
       a = a/10;
   }
   return max - min + 1;
}
public static int digitSum(int a){  
   int sum = 0;
   if(a < 0)
       a = -a;
   while(a > 0){
       sum += a %10;      
       a = a/10;
   }
   return sum;
}

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