INTERVIEW QUESTIONS PROGRAMMING LANGUAGES DETAILS

Question: void main()
{
int i=20;j=35,x,y;
x= y++ + x++;
y= ++y + ++x;
printf(" %d %d" , x,y);
}
/* please tell me the value of x and y at each and every moment. i dont need the answer but the explanation of the anamolus behavior of increment expression.*/

Answer: x=1702 y=2560

x=1702 y=2560 Source: CoolInterview.com

First i explain how the incremental operator works
Y++ means increase the value of y by one. the value of y is incremented by one after the first iteration.

++Y means the value of y is first incremented before iteration and value of y is incremented and then the expression evaluates.

In the above expression the result is :

No value is assigned for x & y so when we declare the variables without assigning the values default values may be present so based on that default values the incremental operator works.

suppose the default values of x & y are 10 & 20 then the expression

x=y++ + x++
x=10+20; x=30

y=++y + ++X
y=11 + 21; y=32 Source: CoolInterview.com

x=y++ + x++
x=10+20; this gives x=30 but x has been post incremented so calue of x becomes 31.

y=++y + ++X
y=21 + 32; y=53
since x is pre-incremented so value of x becomes 32,and by the same reason y becomes 21 . Source: CoolInterview.com

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