how to mark as Correct or Wrong ?!

[pinkdreammsss]

Hey guys ,
i got question around mark a value as correct or wrong and then save it for further usage ,
for example , i want to ask user to answer a mathematical question , if the answer is correct , it marks the answer as correct , if not , it'll mark it as wrong . here is my attempt >

import java.util.Scanner;
public class test {
public static void main (String args []){
int answer;
Scanner input=new Scanner(System.in);
System.out.print(" 5+5 = ? " );
answer=input.nextInt(); 
if (answer=10) {// i need to store the answer as correct or wrong // what should i type here ??? //

[mtyoung]

if (answer=10)

should be

if (answer[COLOR="Magenta"]==[/COLOR]10)

[RamyaSivakanth]

In java == is for comparison operator.But in ur code ur using = "assignment operator".Try the below code.

import java.util.Scanner;
public class Test
{
public static void main (String args [])
{
int answer;
Scanner input=new Scanner(System.in);
System.out.print(" 5+5 = ? " );
answer=input.nextInt();
if (answer==10)
{// i need to store the answer as correct or wrong // what should
System.out.println("Correct ");
}
else
{
System.out.println("Wrong ");
}//if-else
}//main
}

[mtyoung]

for storing ans...
you can declare a boolean variable, default fase and if answer is correct, you set it to true

[pinkdreammsss]

to Ramya ,
i dont wanna print out the message ! actually i'm gonna mark the entered answer as correct or wrong and store it , program will ask 10 questions and user answer , then it calculate the answers and show how many are correct and how many are wrong . in order to compare all answers , i need to mark'em all as either

[pinkdreammsss]

to mtyoung ,
i've tried this and i know it's so foolish !

import java.util.Scanner;
public class faq {
public static void main (String args[]){
int answer;
boolean answer;
Scanner inpur=new Scanner(System.in);
System.out.print(" 5+5 = ? " );
answer=input.nextInt();
if (answer==10) {answer=true;}
else {answer=false;}

so what changes should make ?

[kbindumadhavi]

Try using an array to store the results either true or false.
So that you can retrieve the values for calculating number of correct and wrong answers.
If number of questions are dynamic, then you can use ArrayList for the same.

[mtyoung]

if you want to count number of correct answers, i suggest to use a int variable(may be correctCount) which initialized to 0, and if user answer one correct question, correctCount++

so, you know the total questions(you may also store it in some int variable), and number of correct answers, then you can found out the number of wrong answers

[pinkdreammsss]

hey guys take a look at this , what's wrong with it ?

import java.util.Scanner;
public class faq {
public static void main (String args[]){
Scanner inpur=new Scanner(System.in);
int answer,correct,count;
count=0;
while (answer=9999){
System.out.print(" 5+5 = ? " );
answer=input.nextInt(); 
if (answer==100){
correct++;
System.out.print(correct);}
count++;}
}
}

[pinkdreammsss]

any idea friends ?

[xcallmejudasx]

		Scanner input = new Scanner(System.in);
		boolean correct = false;
		int answer, count;
		count=0;
		while (!correct){
			System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10){
				System.out.print("Correct after "+count+" guesses");
				correct = true;
			}
		count++;
		}

[mtyoung]

1) need to initialize "correct" to 0

2) while (answer=9999)
i dont know why you want to check with answer, but, for comparison, == should be used
i think the "answer" should be "count"


3) if (answer==100)
why check with 100, not 10?

[pinkdreammsss]

this is what i got :

import java.util.Scanner;
public class faq {
public static void main (String args[]){
Scanner input = new Scanner(System.in);
		boolean correct = false;
		int answer, count;
		count=0;
		while (!correct){
			System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10){
				System.out.print("Correct after "+count+" guesses");
				correct = true;
				
				System.out.print(" 5+10 = ? " );
			answer = input.nextInt(); 
			if (answer == 15){
				System.out.print("Correct after "+count+" guesses");
				correct = true;
			}
		count++;
		System.out.print(count++);
		}
		}
		}
		
		}

i want the program display the number of correct n' wrong answer as user finished the quize , i used s.o.p(count++) in order to display correct answers in the end but it doesn't work ...

[mtyoung]

once user get the correct answer, you need to increase count

so after correct = true, you need to increase count by 1

[pinkdreammsss]

guys this is my latest try on this but still got prob , after finishing the test it'll show # 1 , any idea ?

import java.util.Scanner;
public class faq1 {
public static void main (String args[]){
Scanner input = new Scanner(System.in);
		boolean correct = false;
		int count=0;
		int countanswer=0;
		while (answer!=9999){
		count++;
			System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
				
				System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
							
							System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
				
			
				
				System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
				
				
			System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
				
				
				System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
				
				System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
				
				
				System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
				
				
				System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
				
			System.out.print(" 5+5 = ? " );
			answer = input.nextInt(); 
			if (answer == 10) {
				correct = true;
				countanswer++; }
				else {System.out.print("not correct");}
				
		countanswer = (countanswer/count*100);
		System.out.print(countanswer);
		}
		}
		}

[mtyoung]

what is "answer" in the while statement?
boolean correct use for?

in while statement, why set to check not equal to 9999?
so how answer can be 9999 to stop the loop?

[Tshegofatsom]

I don't really know if I understand correctly but initially:
1. You have 10 questions
2. You want to mark if incorrect or correct every time a question is answered.


So why not simply have 2 parallel arrays (Means that you have an array of integers and an array of boolean)

you loop from 0 to 9, every time inside a loop check for the correct answer, if answer is true you assign a boolean to the corresponding answer to true.

I am looking at your code now and I don't really understand why you are writing 10 logical blocks of code inside a while loop.

[pinkdreammsss]

to Tshegofatsom , i'm sorry but i dont get your point ! could gimme an example ?

[Tshegofatsom]

I didn't compile the code but here is the logic. You can even take it further by randomizing the questions since this

Scanner input = new Scanner(System.in);
        int numquestions = 10;
        int answer[] = new int[numquestions]; //
        boolean correct[] = new boolean[numquestions];
        //The above are parallel arrays(have same number of elements)
        //Means that the question[0] will correspond to correc[0] and so on
        //10 can be repplaced according to number of questions you want (user can enter it)
        
        int numberOfcorrectAnswers = 0; //keeps track of correct answerrs
        
        //N.B By the end of this look you still have your values stored in the two arrays
        for(int x = 0; x < 10; x++){
            
            System.out.print("Ask question (5 + 5 = ?): ");//good idea to randomise it. Avoid hardcoding
            answer[x] = input.nextInt(); 
            if(answer[x] == 10){ //validate answer. There can be a better way to do this. Avoid hard coding
                correct[x] = true;
                numberOfcorrectAnswers++;                
            }
            //Disply the number of correct answers here or the average
            //Remember you still have your values here, you can still loop through them
        }

[pinkdreammsss]

thanks , but , what if i want to ask 10 different questions? still using for loop?