Program

pg1.java

package Contest1;

/*
Program1

Find a key??

You are provided with 3 numbers : input1 , input2 input 3;
each of these are four digit numbers within the range >==1000 and 9999,

you are expected to find the key using the below formula;

key == (sum of largest digits of all the 3 numbers ) + (sum of smallest digits of all 3 numbers)
 for e.g. = input1 = 3521 ; input2 = 2452 \, input3 = 1352,  they
 key = (5+5+5) + (1+2+1)
 key = 19;


 */

public class pg1 {

    //Max method
    static int MaxFind(char ch1[])
    {

        int max = ch1[0];                    // sir mene ise jb debug kiya to ye max ko 51 le rha h

        for (int i =0; i<ch1.length;i++)
        {
            if (ch1[i]>max)
            {
                max = ch1[i];

            }
        }
        return max;                            // or return 53 kr rha h jb ki use 5 return krna tha.....
    }


    //Min method
    static int MinFind(char arr11[])
    {
       int min = arr11[0];

        for (int i =0; i<arr11.length;i++)
        {
            if (arr11[i]>min)
            {
                min = arr11[i];

            }
        }
        return min;

    }

    public static void main(String[] args) {

        //all 3 inputs
        int input1 = 3521;
        int input2 = 2452;
        int input3 = 1352;


        //convert into array of input1
        String str1 = "" ;
        str1 = String.valueOf(input1);
        char ch1[];
        ch1 = str1.toCharArray();

        //convert into array of input2
        String str2 ="";
        str2 = String.valueOf(input2);
        char ch2[];
        ch2 = str2.toCharArray();

        //convert into array of input3
        String str3 ="";
        str3 = String.valueOf(input2);
        char ch3[];
        ch3 = str3.toCharArray();


        //for input1 to get max and min value
        int max1 = MaxFind(ch1);
        System.out.println(max1);   // or iska ans 51 de rha h jb ki iska ans 5 anana chahiye ....
        int min1 = MinFind(ch1);

        //for input2 to get max and min value
        int max2 = MaxFind(ch2);
        int min2 = MinFind(ch2);

        //for input3 to get max and min value
        int max3 = MaxFind(ch3);
        int min3 = MinFind(ch3);

        //Now our key is

        int key = ((max1+ max2 + max3 ) + (min1 + min2 + min3));

        System.out.println("our key is " + key);




        char arr10[] = {2,5,7,6,3,1} ;
//
        System.out.println(MaxFind(arr10));  // sir ise mene jab max function kiya tb ans shi aaa rha h ans == 7
//        System.out.println(" max " + max);
//        System.out.println("min " + min );


    }
}

In java7