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Operator Precedence2620

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Operator Precedence2620
What will be the output of the following program?
public class Precedence {
    public static void main(String[] args) {
        int x = 20;
        int y = 10;
        double z = x + y * 7 + y-- + x;

A. 120.0
B. 530.0
C. 1110.0
D. Some other output
E. Compilation Error or Runtime Error
Topic: Java Operator Precedence And Associativity

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User comments below. All of them might not be correct.

Answer is A....Evaluation order is
z = x + 70 + y-- + x (*,/ has higher precedence and then +,- are evaluated from left to right )
z = 20 + 70 + y-- + x
z = 90 + 10 + x (value of y is taken as 10 since y is post decremented )
z = 100 + 20
z =120.00 (type castes to double since z is a double)

Posted by Shashanka Mogaliraju    2014-11-25 04:30:40

E,,, int can't be converted to double

Posted by Raju VarshnEy    2014-11-25 04:31:35

a.X=20...y=10.... wid z=x y*7 y-- x;...usng bodmas rule frst multiplctn wil b done... y*7=70....den x 70=90...y   means frst use den chmg hence frstly y=10 will b added to 90 n den agn x is aded n rslt is120 as z is doubl henc rslt is 120.0

Posted by Asma Mujtaba Khan    2014-11-25 04:33:54

ans is A,,,
type casting is deifintely required to print integer value,,but we have double z which accepts fractional values,so
double z =(int)x+Y*7+y--+x we can have 120,but since we dont have typecasting here,it prints 120.0 which is implicit typwe
type conversion before

Posted by Sai Veerendra    2014-11-25 06:09:33

ans a.                                                                         in this program x,y variables initialized with 20,10.                                                                            double variable z is assigned with one expression.                                                                    in this expression -- sign has highest precedence y-- post decrement so 1st value  of the y get used in this program aft ly decrement y--=10  .z=20+10*7+10+20                                               * gets second priority so z=20+70+10+20.              + gets lowest precedence priority z=120 thn implicitily int convert into double so z=120.0

Posted by Maheshwari Natarajan    2014-11-25 18:44:06

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Posted by Merit Campus    2014-11-26 03:10:12

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