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While Loop Fragments
// To print a horizontal row of 50 asterisks:
(NOTE: there are various ways of accomplishing the same task) |
int
number = 0;
while (number < 50)
{
System.out.print( "*");
number++;
}
System.out.println("\n Here are " +
number
+" stars"); |
int
number = 1;
while (number <= 50)
{
System.out.print( "*");
number++;
}
System.out.println("\nHere are " + number
+ " stars"); |
| // To print the numbers
4 - 14 on a single line: |
int num = 4;
while (num < 15)
{
System.out.print( (num++) + " ");
} |
int num =
4;
while (num <=14)
{
System.out.print(( num++) + " ");
} |
//
Program quits when a -1 is entered:
(NOTE: using a
specified number (called a SENTINEL) to terminate a situation. Also note the use of
ONE keyboard retrieval statement to "prime" the while loop, and a SECOND similar statement to continue the loop.) |
int count = 0;
int grade;
System.out.println("Please enter grade ( enter -1 to quit)"); // -1 is sentinel value
grade=reply.nextInt(); //get first value to start (prime) the while loop
while (grade != -1)
{
count++;
System.out.println("Grade # " + count
+ " is " + grade);
System.out.println("Please enter grade ( enter
-1 to quit) "); //get next while value
grade=reply.nextInt();
} |
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