Java how to add int in an array using loop

Question

i cant seem to figure out the logic, here's my code

class stringrays {
public static void main (String[] args) {

    int[] numrays = {23, 6, 47, 35, 2, 14};
    int i;
    int z;
    int y;

    for (i=1; i < numrays.length; i++) {
        z = numrays[0] + numrays[i];
        System.out.println(z);
    }
}

the above results shows 29 70 58 25 37

which means that array 0 adds array 1, then array 0 adds array array 2 and so on.

what i want, is to add the first array 0 onto the next array and so on.. using a loop condition.

then get the average of the sum.

1) What is your question? 2) Is this homework? If so, it is advantageous to tag it as such. — Andrew Thompson
– Andrew Thompson, Commented Sep 6, 2012 at 8:01
"what i want, is to add the first array 0 onto the next array and so on" is unclear. could you please elaborate — Dinup Kandel
– Dinup Kandel, Commented Sep 6, 2012 at 8:02
Do you mean int z = numrays[0]; /* in loop*/ z += numrays[i]; ? — Peter Lawrey
– Peter Lawrey, Commented Sep 6, 2012 at 8:02
no this isnt homework, its just an exercise i found on the web. — user1645034
– user1645034, Commented Sep 6, 2012 at 8:03

mssb · Accepted Answer · 2012-09-06 08:05:11Z

2

Try this,

int[] numrays = {23, 6, 47, 35, 2, 14};
int z = 0;

for (int i=0; i < numrays.length; i++) {
    z = z + numrays[i];
    System.out.println(z);
}
    System.out.println("Average : "+(z/numrays.length) );
}

answered Sep 6, 2012 at 8:05

mssb

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Comments

CloudyMarble · Accepted Answer · 2012-09-06 08:04:05Z

1

If you mean 23, 6 then 6 + 47 and so on you need to do:

for (i=0; i < numrays.length - 1; i++) 
{
   z = numrays[i] + numrays[i + 1];
   System.out.println(z);
}

answered Sep 6, 2012 at 8:04

CloudyMarble

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1 Comment

Dinup Kandel Over a year ago

and for finding average. z/numrays.length();

Priyank Doshi · Accepted Answer · 2012-09-06 08:13:22Z

1

Or the LambdaJ way :

int sum = sum(asList(1, 2, 3, 4, 5));

answered Sep 6, 2012 at 8:13

Priyank Doshi

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Comments

Amit Deshpande · Accepted Answer · 2012-09-06 08:10:45Z

0

Remove numrays[0] and replace it with z

     int z =0;
for (i = 0; i < numrays.length; i++) {
        z = z + numrays[i];
        System.out.println("Sum:"+z);

    }
    System.out.println("Average:"+z/numrays.length);

edited Sep 6, 2012 at 8:10

answered Sep 6, 2012 at 8:04

Amit Deshpande

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1 Comment

user1645034 Over a year ago

im getting variable z might not have been initialized z = z + numrays[i];

Michele Mariotti · Accepted Answer · 2012-09-06 08:07:45Z

0

it is unclear what you need...

to add a value to the next position:

int[] numrays = {23, 6, 47, 35, 2, 14};

for(int i = 0; i < numrays.length - 1; i++) {
    numrays[i] += numrays[i + 1];
}
System.out.println(Arrays.toString(numrays));

to get the mean value:

int[] numrays = {23, 6, 47, 35, 2, 14};
double sum = 0;

for(int i = 0; i < numrays.length; i++) {
    sum += numrays[i];
}

double mean = sum / numrays.length;


System.out.println(mean);

answered Sep 6, 2012 at 8:07

Michele Mariotti

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Comments

The Cat · Accepted Answer · 2012-09-06 08:09:43Z

0

You could use a "for each" loop, to sum the contents of the array and then find the average.

int sum = 0;

for(int each : numrays)
{
   sum = sum + each;
}

float average = each / numrays.length;

answered Sep 6, 2012 at 8:09

The Cat

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Comments

Kara · Accepted Answer · 2013-09-18 21:11:58Z

0

Check your logic. Now you are printing sum of first and n-th number in array; old z value is lost. For sum in loop, use like z = z + something

edited Sep 18, 2013 at 21:11

Kara

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answered Sep 6, 2012 at 8:06

bigGuy

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