What am I doing wrong. I have problem with operators

Question

I have problem with following code. I am trying to use the operators in the array but I can't make it work.
The result of the program commes up:
58
60
57
The correct result should be:
15
-5
50
What am I doing wrong?
class Operators{
     public void operators (){              
          char [] operator = {'+','-','*'};
          int a = 5;
          int b = 10;
          for (int i=0; i<3;i++){              
               int c = a+operator[i]+b;
               System.out.println(c);          
     public static void main (String[] args){
Operators op = new Operators();
op.operators();

Answer 1

Sorry to confuse you. When I have posted the first message I tried to simplify the problem. By doing this thought that I could figure out the rest of the problem by myself. But instead of getting answers I got more confused. What I am trying to do am:
To take six or more numbers and put operators between numbers and display the result. I need to display the results for all possible operator combinations between the numbers.
For example if I take six numbers 10,20,30,40,50,60 and I put the arithmetic operators in between the numbers I would like to create all possible results operator combinations and what the result would be.
10+20+30+40+50+60 = 210
10+20+30+40+50-60 = 90
10+20+30+40+50*60 = 3150