how to create a subprogram that finds the sum of the elements entered by a user

Question

Here is the subprogram I wrote:

public static int profitCalc(int num[])
{
    int sum = 0;
    
    for (int i = 0; i < num.length; i = i + 1)
    {
        sum +=  num[i];
    }
    return sum;
}

But when I enter it (like the code below), it gives me an error.

System.out.println(profitCalc(profit[]));

Answer 1

You haven't declared the Integer array

int[] profit = new int[]{1,2,3,4,5}; 
System.out.println(profitCalc(profit));

Whole code:

    class Main {
    public static int profitCalc(int num[])
    {
        int sum = 0;

        for (int i = 0; i < num.length; i = i + 1)
        {
            sum +=  num[i];
        }
        return sum;
    }

    public static void main(String args[]){
        Scanner input = new Scanner(System.in);
        System.out.println("Enter no of vechile:");
        int noOfVechile = input.nextInt();
        int[] profit = new int[noOfVechile];
        for(int i=0;i<profit.length;i++){
            System.out.println("Enter profit of vechile "+(i+1));
            int profitPerVechile = input.nextInt();
            profit[i]=profitPerVechile;
        }

        System.out.println(profitCalc(profit));
    }

}