#looking for values from arrays

61 messages · Page 1 of 1 (latest)

deft gyro
# 

    public static void main(String[] args) {
    
    int[][] array ={
            { 5, 5, 6, 67, 9, 9, 9, 9, 4, 4, 4, 4, 5, 0, 9, 9, 4}, 
            { 5, 66, 8, 6, 7, 43, 7, 43, 5, 4, 5, 4, 89, 4, 7, 43, 5},
            { 4, 6, 5, 3, 8, 4, 8, 4, 6, 9, 6, 9, 2, 5, 8, 4, 6},
            { 6, 4, 4, 3, 0, 6, 0, 6, 7, 5, 7, 5, 76, 6, 0, 6, 7},
            { 9, 6, 8, 6, 6, 3, 6, 3, 7, 34, 7, 34, 89, 3, 6, 3, 7},
            { 65, 4, 77, 4, 2, 8, 2, 8, 5, 5, 5, 5, 4, 6, 2, 8, 5},
            { 2, 3, 4, 8, 43, 43, 43, 43, 4, 3, 4, 3, 6, 3, 43, 43, 4},
            { 9, 4, 0, 38, 8, 3, 8, 3, 8, 6, 8, 6, 3, 7, 8, 3, 8},
            { 5, 3, 5, 6, 0, 3, 0, 3, 8, 3, 8, 3, 63, 2, 0, 3, 8},
            { 3, 4, 4, 64, 23, 4, 23, 4, 78, 5, 78, 5, 4, 6, 23, 4, 78},
            { 7, 89, 34, 5, 0, 3, 0, 3, 7, 78, 7, 78, 4, 3, 0, 3, 7},
            { 6, 3, 6, 6, 4, 3, 4, 3, 6, 42, 6, 42, 8, 4, 4, 3, 6},
            { 4, 4, 0, 53, 4, 3, 4, 3, 1, 12, 1, 12, 4, 5, 4, 3, 1},
            { 5, 9, 2, 6, 8, 5, 8, 5, 9, 3, 9, 3, 65, 4, 8, 5, 9},
            { 4, 7, 8, 3, 4, 4, 4, 4, 7, 4, 3, 4, 3, 2, 11, 4, 89},
            { 4, 7, 8, 8, 4, 9, 4, 4, 8, 9, 3, 9, 9, 2, 4, 2, 3},
            { 4, 7, 8, 6, 2, 4, 4, 4, 0, 4, 3, 4, 2, 9, 4, 4, 3},
            };
    
            int count=1;
            int z=0;
            int sum=0;
            for (int i=0; i<array.length;i++){
                int middle= array.length/2;
                
                for (int j=(middle-count);j<middle+count;j++)
                    
                    sum += array[i][j];
                count=count+z;
                count++;
                if (count>=8){
                   
                    z++;
                    count=count-z;
                   
                }
            }
            
            System.out.println("Sum=" + sum );
           
    }
}```
i think the code is fine but whenever i run it, the answer is wrong the answer should be 1662
glacial yarrowBOT
#

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sand kiln
#

but the code gives

deft gyro
#

it gives 2189

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this is what im trying to do btw

image.png
craggy tiger
# deft gyro this is what im trying to do btw

the error is here: for (int j=(middle-count);j<middle+count;j++)
middle is int middle= array.length/2; and == 8;
so for first iteration of inner loop you have for j=(8-1); j < (8+1); j++). So for first row inner loop will be working from 7 (inclusive) to 9 (exclusive), so it sum up indexes 7 and 8. But it's supposed to involve only one element

deft gyro
craggy tiger
deft gyro
#

if i put the count=0 doesnt that mean that itll be 8-0/8+0?

craggy tiger
#

yes, so you need to fix it. That's why I said you also need to change the condition to make it work for 8 too

errant bramble
#

I think you should try outputting the pattern first. Have you ever come across such a pattern but using "*". Then when you get that it will be easy

deft gyro
#

im sorry im still quite lost

craggy tiger
#

if you leave the inner loop as it is for (int j=(middle-count);j<middle+count;j++) and having count = 0; you will be having
for (int j=8;j<8;j++). So loop wont work for first row (for j==8) but you need it to work for j ==8

#

so you need to change the condition of that loop

#

you need not <, but <=

#

now, 8 will be inclusive

#

I've implemented it already and getting 1662 as answer of sum. So I will help you if you put enough effort too

deft gyro
#

okay wait

#

i just want to confirm

#

we need 8 and not 9 because the array starts with 0 right?

craggy tiger
#

(according to the picture)

deft gyro
#

so the issue is in row 1 and not row 0?

craggy tiger
#

I said in first row, so row with index 0

deft gyro
#

i see

#

so by changing my count to 0 and by adding <= it will be inclusive of column 8 only for first row?

craggy tiger
#

exactly

deft gyro
#

i seee

#

okay wait lemme change it

#

i got 2117

craggy tiger
#

because you have mess with counter and z (dunno why you put one more variable)

#

let me explain

#

you need to do count++ to the middle row

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as you reached the middle row, you need do count--

deft gyro
#

mhmm

craggy tiger
#

now convert my words into the java code

deft gyro
#

count++
if (count>=8){
count--
}

#

?

craggy tiger
#

nope

deft gyro
#

if (i>=8)?

craggy tiger
craggy tiger
deft gyro
#

if (i>=8)
count--;
else
count++;

#

?

craggy tiger
#

yeah

#

but use middle instead of 8. Don't hardcode values

deft gyro
#

ahh

craggy tiger
# 
if (i >= middle) count--;
else count++;
deft gyro
#

ahhh right since i already have middle initialized

craggy tiger
#

now it should return 1662

deft gyro
#

yeap i got it now

#

thank you very much

glacial yarrowBOT
# deft gyro thank you very much

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deft gyro
#

i really appreciate it

craggy tiger
#

np 😉

craggy tiger
deft gyro
#

ouh