通过For循环添加数组偶数值。 C＃

Question

I am to establish an array and add only the even numbers in the array through a for-loop . I've established the array but unsure how to apply it in the loop. I think I have to use the % operator to only select the even numbers in the array. I know how to set up a typical For-Loop but unclear how to use it with an array. Any help works.

int[] bills = new int[5];

bills[0] = 131;
bills[1] = 121;
bills[2] = 2000;
bills[3] = 333;
bills[4] = 120;
bills[5] = 334;

Answer 1

Quick suggestion, use % (modulus) operator check for remainder like arrayvalue % 2 == 0 if condition true then it's even number else odd.

foreach(int val in bills)
{
    if(val % 2 == 0)
    {
        //It's even number ... do your processing
    }
    else { continue; }
}

Answer 2

As a beginner, you could start using foreach loop to loop through each value. To see the value is even or odd just apply modulus operator and check reminder is zero or not.

foreach(int bill in bills)
{
    if(bill%2 ==0)
    {
        //logic here
    }
}

Another approach, using Linq .

int[] onlyEventValues = bills.Where(x=> x%2==0).ToArray(); // filters and returns an array of even values.

Answer 3

Use foreach to loop all numbers you have
Use List<int> to save only even numbers

List<int> evenNumbers = new List<int>();
foreach(int val in bills)
{
    if(val % 2 == 0)
    {
        evenNumbers.Add(val);
    }
}