Can someone clarify this piece of code for me.

The program creates a multidimensional array and then a Max number in a user specified column.

I don't understand how the if lines actually work in this code. Please explain your thoughts.

public static void main(String[] args)
{

double [][] familyCellBills = { {45.24, 54.67, 32.55, 25.61},
{65.29, 49.75, 32.08, 26.11},
{75.24, 54.53, 34.55, 2816} };

String [] familyMembers = {"Joe", "Jane", "Mike" , "Sarah"};
for ( int i = 0; i < familyMembers.length; i++ )
System.out.println( "Family member" + i + "; " + familyMembers[i] );

Scanner scan = new Scanner( System.in );
int currentMember;
do
{
System.out.print( "Enter a member number between 0 and3 > ");
currentMonth = scan.nextInt();
}
while (currentMonth < 0 || currentMonth > 3 );

double memberMaxBill = FamilyCellBills[0][currentMember];
for ( int i = 1; i < familyCellBills.length; i++ )
{
if ( currentMember < familyCellBills[i].length )
//UPDATEMAXBILL
if (familyCellBills[i][currentMember] > memberMaxBill )
memberMaxBill = familyCellBills[i][currentMember];
}
}
}

NumberFormat priceFormat = NumberFormat.getCurrencyInstance();
System.out.println( "\nThe total family cell bills during "
+ months[currentmember] + " is "
+ priceFormat.format(memberMaxBill));

}
}

does this code even work?

Code:

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while (currentMonth < 0 || currentMonth > 3 );

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since you have 3 months bills only i'm guessing you mean this to say:

Code:

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while (currentMonth > 0 && currentMonth <= 3)

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Code:

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double memberMaxBill = FamilyCellBills[0][currentMember];

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where is FamilyCellBills with capital 'F' defined? Java is case sensitive.

How the IF works:
maxMemberBill is set the the first person in the array i.e. familyCellBills[0] who is Joe.
then you have this conditional statement in your while loop:

Code:

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if ( currentMember < familyCellBills[i].length )

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which means that if current member index (index 0) is less than number of members (4) then carry on (so long as currentMember is incremented after each loop then this will cause the code in the IF statement to run only four times - and then your While loop should be broken by adding another IF statement after this one to check if currentMember >= 4)

your next IF statement checks Joe's bill is greater than the other members bills. if any other bill is greater, maxMemberBill is set to the greater one.

Code:

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memberMaxBill = familyCellBills[i][currentMember];

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your code is messy and could be improved still

Quote:

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Originally Posted by DavidPynes

The program creates a multidimensional array and then a Max number in a user specified column.

I don't understand how the if lines actually work in this code. Please explain your thoughts.

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This isn't your code, right? Go ask the author of the code if you don't understand it; s/he knows best.

kind regards,

Jos