Question

This program will calculate the average grade for 4 exams using a for loop by prompting
the user for exam grades, one at a time, then calculate the average and display the result.

public class ExamsFor4 {

public static void main(String[] arguments) {


int inputNumber; // One of the exams input by the user.
int sum = 0;     // The sum of the exams.
int i;       // Number of exams.
Double Avg;      // The average of the exams.

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

for ( i = 1; i <= 4; i++ ) {  

    sum += inputNumber;                 // Add inputNumber to running sum.
    TextIO.put("Please enter the next exam: ");     // get the next exam.   
    inputNumber = TextIO.getlnInt();

        if (i == 4) {
            Avg = ((double)sum) / i;
            TextIO.putln();
            TextIO.putln("The total sum for all " + i +" exams is " + sum);
            TextIO.putf("The average for the exams entered is %1.2f.\n", Avg);
            break;

        }
} 

}   // end main ()
}  // end class ExamsFor4

My result:

Please enter the first exam: 100
Please enter the next exam: 99
Please enter the next exam: 98
Please enter the next exam: 97
Please enter the next exam: 96
The total sum for all 4 exams is 394
The average for the exams entered is 98.50.

This would be correct except for the last print out of: ‘Please enter the next exam: 96‘
I tried putting the IF statement between the ‘sum‘ line and the TextIO.put 'Enter next exam', but that isolates it.

Thanks, from a Network Dude trap in a Programmer’s world.

Answer 1

You should probably put the if-statment outside the for-loop. That way you don’t need the if-statement. Second the statement in the loop should be < 4 instead of <= 4.

public class ExamsFor4 {

public static void main(String[] arguments) {


int inputNumber; // One of the exams input by the user.
int sum = 0;     // The sum of the exams.
int i;       // Number of exams.
Double Avg;      // The average of the exams.

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

for ( i = 1; i < 4; i++ ) {  

    sum += inputNumber;                 // Add inputNumber to running sum.
    TextIO.put("Please enter the next exam: ");     // get the next exam.   
    inputNumber = TextIO.getlnInt();
} 

Avg = ((double)sum) / i;
TextIO.putln();
TextIO.putln("The total sum for all " + i +" exams is " + sum);
TextIO.putf("The average for the exams entered is %1.2f.\n", Avg);
break;

}   // end main ()
}