Thread: Using FOR and WHILE loops to find average (DUE TONIGHT)

The user should be instructed to enter three numbers and add them up by using a for loop to accomplish this. The program should then find the average of the three numbers.

After this is accomplished the program should allow the user to add numbers using a while loop that terminates when the user enters -999. The number of entries the user has placed into the sum should then divide the sum.

Here is the revision, but I still need help.

 public static void main(String[] args) throws FileNotFoundException {
		PrintWriter prw = new PrintWriter("outfile5B.txt");
		Scanner kb = new Scanner(System.in);
 
		String input;
		int num, sum = 0, average, numAmount;
		final int DIV = 3;
 
		// Part 1
		System.out .println("Do you wish to start?");
		input = kb.nextLine();
		//the program terminates here, idk why?
		if (input == "yes"){
			for(int count = 1 ;count <= 3; count++){
			num = kb.nextInt();
			sum += num;
			average = sum / DIV; // will this give me an average?
            System.out.println("Sum is: " + sum);
			System.out.println("Count is: " + count);
			System.out.println("Your average is: " + average);
 
		}
		// Part 2
		System.out.println("Do you wish to add numbers? If so, enter how many. If not enter -999 to abort.");
		numAmount = kb.nextInt();
		while(numAmount > -999){
			System.out.println("Enter your number(s)");
			// how do I complete the average here?
			average = sum / numAmount;
			System.out.println("Your average is: " + average);
			}
		}
		else if (input == "no"){
			System.out.println("You have terminated the program");

better? there are questions in green

I noted the couple tweaks that had to be made

PrintWriter prw = new PrintWriter("outfile5B.txt");
		Scanner kb = new Scanner(System.in);
 
		String input;
		int num, sum = 0, numAmount;
double average; // made this a double for increased accuracy
		final int DIV = 3; // no need for this
 
		// Part 1
		System.out.println("Do you wish to start?");
		input = kb.nextLine();
		//the program terminates here, idk why?
		if (input.equals("yes")){ // Use the .equals command when comparing a string rather than ==     that was why it was terminating
			for(int count = 1 ;count <= 3; count++){
			num = kb.nextInt();
			sum += num;
			average = (double) sum / count; // divide by count to get the average of numbers entered so far, and type cast to double
            System.out.println("Sum is: " + sum);
			System.out.println("Count is: " + count);
			System.out.println("Your average is: " + average);
 
		}
sum = 0; // reinitialize sum as 0 for next loop
int ct = 0; // this variable will count the number of integers entered so you can average them
while(numAmount > -999){
			System.out.println("Enter your number(s)");
numAmount=kb.nextInt(); // put this inside the loop so it can continue to get input
sum += numAmount;
ct += 1;
			// how do I complete the average here?
			average = (double) sum / ct; // computes the new average
			System.out.println("Your average is: " + average);
			}

I included tags in the parts of the code I altered that explain it.

Take a look at this for help on how Scanners work. Scanner (Java 2 Platform SE 5.0)