Matrix programming in Java

Computer Science Level 2

Observe the following coding in java & find out the output:

class Matrix{

void display()
{

    int a[]={1,6,3,4,0,12,2,5};
    int l=a.length;
    for(int i=0;i<l;i++){
        switch(i)
        {
            case 0:a[i]=a[i+1];
            case 2:a[i]=a[i+2];
            case 6:a[i++]=a[i];
            break;
            case 7:a[i]=a[i-1];
            default:a[i]=a[i++];
        }}
        System.out.print("{");
        for(int i=0;i<l;i++)
        System.out.print(a[i]+",");

        System.out.println("}");
    }

    public static void main(String args[])
    {
        new Comprogzz().display();
    }
}

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{4,5,0,6,6,12,3,4} {3,6,4,0,5,5,12,4,} {6,6,4,4,0,12,5,5,} {4,4,6,6,0,12,5,5}

2 solutions

Aditya Joshi
Mar 24, 2014

In the first iteration of the $\mathsf{for}$ loop, value of $\mathsf{i} = 0$ . Therefore, we will execute $\mathsf{case}$ $0$ .

In this case,

a[0] = a[0 + 1]

In other words, the value of $\mathsf{a[0 + 1] = a[1]}$ is placed in $\mathsf{a[0]}$ . $6$ is placed in $\mathsf{a[0]}$ .

That's basically it, we don't have to look at any other options as there is only one option whose first value is $6$ .

according to me sum syntax error are their on that program .

program

switch(i)

# { # case 0:a[i]=a[i+1]; break; #case 2:a[i]=a[i+2];break;;
# case 6:a[i++]=a[i];break; #case 7:a[i]=a[i-1];break; # default:a[i]=a[i++]; # }

then we will get correct output {6,6,4,4,0,12,5,5,}

Yugandhar Reddy - 7 years, 2 months ago

yaa break is important or else the output will change

Sid Lodha - 7 years, 2 months ago

First case 0, then case 2 and then case 6 can be executed without a break. It's called fall through. Check this out

http://javascript.about.com/od/hintsandtips/a/fallthrough.htm

Abc Def - 7 years ago

hmm

sasui wagan - 7 years, 2 months ago

Good thing this break thing works the same as in C and that I inferred how the ++ operator worked, so that all further instances of i are affected (but maybe this is identical to C too :) )

Paul Paul - 6 years, 10 months ago

First of all above program won't run and it will give you a compilation error as Comprezz class is not defined. We have to change that to Matrix class. Secondly we are getting {6,6,4,4,0,12,5,5} output because if we don't provide break; statement in switch cases it will continue to run the next cases also.

Amit Kumar Swami - 7 years, 2 months ago

Please give Clear Solution

Daniel Morla - 7 years, 2 months ago

https://ideone.com/fork/CnOCS6 - It's showinjg errors and btw, http://comprogzz.in/ is malicious.

Aryan Gaikwad - 7 years, 2 months ago

Phani Kumar
Oct 10, 2015

first switch case for a[0] a[0]=a[0+1]=a[1]=6 that's the only option

Matrix programming in Java

2 solutions

program

switch(i)

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