Hello, so I am creating a program in netbeans that gives a 10 question quiz and calculates how many are right or wrong and tells the student what his or her grade is afterwards. I've figured out most of it except the variable for the number of correct answers being printed in the output correctly. When I tried to make the variable numCorrect add one whenever the user gets it right, I print the variable afterwards and it still says zero

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package assignment4;

import static java.lang.System.out;

import java.util.Random;

import java.util.Scanner;

/**

*

* @author Harper

*/

public class Assignment4 {

// standard final static variables that all methods can share

final static Scanner cin = new Scanner(System.in);

final static Random rand = new Random();

public static void main(String[] args) {

// output identification

int x=1, numProbs=10, numCorrect=0, probNum=1;

out.print("CPS 150 Assignment 4 by Harper Miller ");

out.println();

out.println("Welcome to the Addition tutor program");

out.print("Enter your Given name (no spaces):");

String name=cin.nextLine();

out.println();

out.println("Greetings, " +name + "!");

out.println("I will ask you 10 Problems");

out.println("Ready, set, go!");

while (10>=x){

oneProblem(numCorrect , probNum);

probNum+=1;

x+=1;}

// NEED TO ADD THINGS HERE (THE DEFINITE LOOP SHOULD BE HERE!)

out.print(numCorrect);

out.print(" Assignment 4 complete ");

} // end main

// function to present one problem to the learner

static int oneProblem(int numCorrect, int probNum) {

int z , y , answer;

z=10+rand.nextInt(90);

y=10+rand.nextInt(90);

out.print("Problem " + probNum + ": " + z + " + " + y + "= ? ");

answer=cin.nextInt();

if (z+y == answer){

numCorrect++;

out.println("Your answer is correct!");}

else{

answer= z+y;

out.println("your answer is wrong. The correct answer is:" + answer);}

return numCorrect ; // to let the program compile

} // end oneproblem

static void report(String name, int numProbs, int numCorrect) {

// NEED TO ADD THINGS HERE

} // end report

static char getLetterGrade(int numProbs, int numCorrect) {

// NEED TO ADD THINGS HERE

return 'X'; // to let the program compile

} // end getLetterGrade

}