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PONew to For Loops, looking for a bit of guidance
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  1. PONew to For Loops, looking for a bit of guidance
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    copied!<p>The program I am writing is one that has a validation loop to see if a family has the right amount of members for a survey (3-6) about their househould mpg. If they don't i have the program setup to tell them the do no meet the requirements and must enter a different number if they would like to proceed. I understand the validation loop i think, but the next part of the <code>for</code> loop is not as easy.</p> <p>I'm not sure how the program will know how many times the user should enter the different mpgs for each car in the family. For instance if one family has 3 members and the other has 5. I need a separate input box. I'm mostly confused on what i would put in the for argument. Here is my code that I have so far.</p> <p>EDIT: I have what I think is the correct way to format the for loop. Now I have to figure out how to have the user input the data into the body of the for loop. So if they have 3 cars I need to have them enter the mpg for each and then calculate the average. Im stuck on how to store each cars mpgs separately. </p> <pre><code>import javax.swing.JOptionPane; public class MpgRetry { public static void main(String[] args) { String familyMembersStr, mpgStr; int familyMembers; int mpgAverage; familyMembersStr = JOptionPane.showInputDialog("Please enter number of family members: "); familyMembers=Integer.parseInt(familyMembersStr); while(familyMembers &lt;3 || familyMembers &gt;6) { JOptionPane.showMessageDialog(null, "Sorry, this survey can only use data from families with 3-6 members."); familyMembersStr = JOptionPane.showInputDialog("Please enter the number of family members (3-6): "); familyMembers = Integer.parseInt(familyMembersStr); } double[] mpg = new double[familyMembers]; // creat array to hold values for (int i = 0; i &lt; familyMembers; i++) { // assuming each member has one car mpgStr = JOptionPane.showInputDialog("Please enter MPG each car (separately): "); mpg[i] = Integer.parseInt(mpgStr); } mpgAverage = (mpg / familyMembers); JOptionPane.showMessageDialog(null,"The average mpg of this family is " + mpgAverage + "."); } </code></pre> <p>}</p>
 

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