Confused on error in array.. (Java)

[bkquinn359]

Hi All,
I am getting the follwoing error

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at Chp8Assign1.main(Chp8Assign1.java:37)
Press any key to continue...

In this program...

public class Chp8Assign1 {
public static void main (String args [ ] )
{
int myArray [ ] = new int [ args.length ]; // for loop to convert String args array to integer myArray
int gradeA = 0, gradeB = 0, gradeC = 0, gradeD = 0, gradeF = 0;
for (int a = 0; a < args.length ; a++)
{
myArray [a ] = Integer.parseInt (args [ a ] );
if(myArray [a] >= 90)
{
gradeA++;
}
else if(myArray [a] >= 80 && myArray [a] <= 89)
{
gradeB++;
}
else if(myArray [a] >= 70 && myArray [a] <= 79)
{
gradeC++;
}
else if(myArray [a] >= 60 && myArray [a] <= 69)
{
gradeD++;
}
else if( myArray [a] <= 60)
{
gradeF++;
}
}
int sum = 0;

int largest = myArray[0];
int smallest = myArray[0];
// for loop to find sum, largest and smallest
for (int i = 0; i<myArray.length; i++ )
{
sum = sum + myArray [i]; if ( myArray [ i ] > largest )
largest = myArray [ i ]; if ( myArray [ i ] < smallest ) smallest = myArray [ i ];
}
System.out.println("The sum is " + sum);
System.out.println("The average is " + sum/myArray.length);
System.out.println("The largest number is " + largest);
System.out.println("The smallest number is " + smallest);
System.out.println("The number of students with scores of 90-100 (A) is " + gradeA);
System.out.println("The number of students with scores of 80-89 (B) is " + gradeB);
System.out.println("The number of students with scores of 70-79 (C) is " + gradeC);
System.out.println("The number of students with scores of 60-69 (D) is " + gradeD);
System.out.println("The number of students with scores below 60 (F) is " + gradeF);
} // ends main
}


Could anyone point me in the right direction?

Thanks.

[JosAH]

Could anyone point me in the right direction?

Thanks.

You're defining an array as long as the number of arguments you supplied on
the command line. You didn't supply any arguments so you end up with an
array having 0 (zero) elements.

kind regards,

Jos

[sukatoa]

Hi All,
I am getting the follwoing error

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at Chp8Assign1.main(Chp8Assign1.java:37)
Press any key to continue...

In this program...

public class Chp8Assign1 {
public static void main (String args [ ] )
{
int myArray [ ] = new int [ args.length ]; // for loop to convert String args array to integer myArray
int gradeA = 0, gradeB = 0, gradeC = 0, gradeD = 0, gradeF = 0;
for (int a = 0; a < args.length ; a++)
{
myArray [a ] = Integer.parseInt (args [ a ] );
if(myArray [a] >= 90)
{
gradeA++;
}
else if(myArray [a] >= 80 && myArray [a] <= 89)
{
gradeB++;
}
else if(myArray [a] >= 70 && myArray [a] <= 79)
{
gradeC++;
}
else if(myArray [a] >= 60 && myArray [a] <= 69)
{
gradeD++;
}
else if( myArray [a] <= 60)
{
gradeF++;
}
}
int sum = 0;

int largest = myArray[0];
int smallest = myArray[0];
// for loop to find sum, largest and smallest
for (int i = 0; i<myArray.length; i++ )
{
sum = sum + myArray [i]; if ( myArray [ i ] > largest )
largest = myArray [ i ]; if ( myArray [ i ] < smallest ) smallest = myArray [ i ];
}
System.out.println("The sum is " + sum);
System.out.println("The average is " + sum/myArray.length);
System.out.println("The largest number is " + largest);
System.out.println("The smallest number is " + smallest);
System.out.println("The number of students with scores of 90-100 (A) is " + gradeA);
System.out.println("The number of students with scores of 80-89 (B) is " + gradeB);
System.out.println("The number of students with scores of 70-79 (C) is " + gradeC);
System.out.println("The number of students with scores of 60-69 (D) is " + gradeD);
System.out.println("The number of students with scores below 60 (F) is " + gradeF);
} // ends main
}


Could anyone point me in the right direction?

Thanks.

There is nothing wrong with your code....

except that you tend to execute it without initial values at execution....

java Chp8Assign1

That may lead to ArrayIndexOutOfBoundsException....
Some codes are depending on args values... If none, you have to put a trap on your code.... or you could use try/catch block....

java Chp8Assign1 98 89 95 97 92

regards,
sukatoa