Question

Had to write the following program for an on line pre java class using, while, do-while and for loops.
Looking for a little explanation. Thanks in advance!
PS While looking for reference books is this Java or Javascript? Any suggestions for a good reference book? I get the concept, mostly, the devil is certainly in the details.

public class ExamsFor {

    public static void main(String[] arguments) {


    int inputNumber; // One of the exams input by the user.
    int sum;     // The sum of the exams.
    int count;   // Number of exams.
    Double Avg;    // The average of the exams.


    /* Initialize the summation and counting variables. */

    sum = 0;
    count = 0;

    /* Read and process the user's input. */

    TextIO.put("Please enter the first exam: "); // get the first exam.


        inputNumber = TextIO.getlnInt();

    for (inputNumber!=0; sum += inputNubmer; count++ ) {  // had the while loop below enter here, worked

    TextIO.put("Please enter the next exam, or 0 to end: "); // get the next exam.  
    inputNumber = TextIO.getlnInt();
    } 

    /* Display the result. */

    if (count == 0) {
    TextIO.putln("You didn't enter any data!");
    }
    else {
    Avg = ((double)sum) / count;
    TextIO.putln();
    TextIO.putln("You entered " + count + " exams.");
    TextIO.putf("The average for the exams entered is %1.2f.\n", Avg);
    } 

    } // end main ()
}  // end class ExamsFor

/*  Had the following 'while loop' in place of the 'for loop'


while (inputNumber != 0) {
    sum += inputNumber;  // Add inputNumber to running sum.
    count ++;        // Count the input by adding 1 to the count.

*/

Answer 1

Shouldn’t your for loop be: (note the preceding ; and a typo in sum+=inputNumber)

for (;inputNumber!=0; sum += inputNumber, count++ )

The while loop would be

while(inputNumber!=0) {
// rest of the things
 sum+=inputNumber;
 count++;
}