Chapter5_Arrays_Ex10

import java.util.Scanner;
/*
    =====================================================
                   chapter 5: Arrays

      Ex10: The column where the character appears most frequently
    =====================================================
*/

public class MyProgram {
    public static void main(String[] args) {

        //variables
        final int SIZE=5;
        char arr[][]=new char[SIZE][SIZE];

        char c;     //the character we are searching in the matrix
        int maxCol=0;  //represent the col with most repetitions
        int count=0;    //counter for each col
        int repeat=0;   //max repetition

        Scanner s=new Scanner(System.in);

        //user input → init matrix
        System.out.println("Matrix: Enter char: ");
        for(int i=0;i<arr.length;i++){
            System.out.println("row "+i+" :");
            for (int j=0;j<arr[i].length;j++){
                arr[i][j]=s.next().charAt(0);
            }
        }

        //user input → init char
        System.out.println("Enter single char: ");
        c=s.next().charAt(0);

        //loop count the max repetitions
        for(int col=0;col<arr[0].length;col++){
            for(int row=0;row<arr.length;row++){

                //if c found in matrix inc counter
                if(arr[row][col]==c){
                    count++;
                }
            }

            //if we found col with more repetitions
            if(repeat<count){
                repeat=count;    // update repeats
                maxCol=col;     // update the max col
            }
            count=0;    //reset count
        }

        //display msg
        if(repeat>0)
            System.out.println(c+" most repetition in colume number "+maxCol);
        else
            System.out.println("no repetition");
    }
}