##
Problem Statement - Output Writing – Pixel structure passed by reference

Write down the output of the program and give steps in arriving at such output.

struct Pix {int x,y;};
void show(Pix &p)
{
cout<<p.x++<<","<<++p.y<<endl;
}
int main()
{
Pix P={50,60},Q,R;
R=P;
show(R);
P.x+=10;P.y+=30;
Q=R;
show(P); show(Q); show(R);
return 0;
}

## Solution

## Run Output

`50,61`

60,91

51,62

51,62

Steps in arriving at output:

** Pix P={50,60},Q,R; **

Here P will contain P.x=50 and P.y=60. Q.x,Q.y and R.x and R.y will have indeterminate values.

**R=P;**

Here R.x and R.y will have values same as P.x and P.y so they will be 50 and 60 respectively.

**show(R);**

Since value of y has a pre-increment so the value printed would be 50,61

**P.x+=10;P.y+=30;**

Now P.x will become 50+10 = 60 and P.y will become 60+30=90.

**Q=R;**

Here values of R.x and R.y will be copied to Q.x and Q.y so they will become 51 (due to previous post increment) and 61 as fixed earlier.

**show(P);**

This should print 60 and 91 (due to pre-increment in show)

**show(Q);**

This should print 51 and 62 due to pre increment in show

**show(R);**

This should also print 51 and 62 again to due to pre-increment in show.

sunmitra| Created: 24-Jan-2018 | Updated: 18-Dec-2018|

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