Answer:
In this case, the braces are not really needed, but are probably a good idea, for clarity:
if ( a == b )
{
if ( d == e )
total = 0;
else
total = total + b;
}
Of course, the indenting is absolutely essential for clarity.
In this case, the braces are not really needed, but are probably a good idea, for clarity:
if ( a == b )
{
if ( d == e )
total = 0;
else
total = total + b;
}
Of course, the indenting is absolutely essential for clarity.
Here is the complete program that adds up user-entered integers.
It now includes nested ifs that select the proper ending
for the numbers in the prompt.
The program is getting a little bit complicated. The logic involved in prompting the user for the next integer is more complicated than the logic involved in doing the main job of adding up all the integers!
It is common in programming (and in many other endeavors) for the details to take more work than the main task. It is important to be clear about the main task and to get it right, then to add the details.
It would be nice to put the prompting logic into a separate
method called something like promptUser().
This is the topic of a future chapter.
import java.io.*;
// Add up integers entered by the user.
// After the last integer, the user enters a 0.
//
class AddUpNumbers
{
public static void main (String[] args )
{
Scanner scan = new Scanner( System.in );
String inputData;
String suffix;
int value; // integer entered by the user
int count = 0; // how many integers added so far
int sum = 0; // initialize the sum
// get the first value
System.out.println( "Enter first integer (enter 0 to quit):" );
value = scan.nextInt();
while ( value != 0 )
{
//add value to sum
sum = sum + value; // add current value to the sum
count = count + 1; // one more integer added
// prompt for the next value
if ( count+1 == 2 )
suffix = "nd";
else
if ( count+1 == 3 )
suffix = "rd";
else
suffix = "th";
System.out.println( "Enter the " + (count+1) + suffix +
" integer (enter 0 to quit):" );
//get the next value from the user
value = scan.nextInt();
}
System.out.println( "Sum of the integers: " + sum );
}
}
(Thought Question:) The main topic of this chapter is sentinel-controlled loops. Must a sentinel be an integer?