Question

Here im required to Write a method printArray that displays the contents of the array num and Display the contents of the array with each
number separated by a space. and i have to start a new line after every 20 elements.

i wrote this code but whenever i try to execute it, it shows the array without the new line

public class project2 {

    public static void main(String[] args) {

        int num []= new int [100];

        for (int i=0;i<num.length;i++){

            num[i]=-1;
            num[7]=7;
        }


        printArray(num);
        System.out.println(num);


    }

    public static void printArray (int array1[]){

        int count =20;
        for (int x=0;x<array1.length;x++){

            System.out.print(array1[x]+" ");
            if (array1[x]==count){

                System.out.println(" ");
                count=array1[x]+count;

            }

        }
    }
}

Answer 1

You should use the modulo (or remainder) operator (%), that suits your usage much better:

for (int x=0;x<array1.length;x++){
    System.out.print(array1[x]+" ");
    if (x>0 && (x%count)==0){
        System.out.println(" ");
    }

}

This way, you will get a new line every count characters, and the first line will not have it (that is why the x>0 check is there).

Also, in the original post, this line is frankly totally bad:

count=array1[x]+count;

Just what would it do? Why do you add the value stored in the array to the fixed counter? Considering this line, I advise that you should really sit back a bit, and try to think about how things work in the background… There is no magic!