1. which of the following expressions evaluates multiplication first addition second and multiplication third
a. 2*3+4*5
b. (2*3)+(4*5)
c. 2*(3+4)*5
d. 2*(3+4*5)
2. after the following two statements, what is the value of j?
int i=10;
int j=10*i++;
a. 100
b. 101
c. 110
d. 111
3. consider the following code.
int x=1;
int y=2;
system. out. println ("the sum of x and y is" +x+y+".");
what would be the result of the last statement?
a. it would display the text, "the sum of x and y is 3."
b. it would display the text, "the sum of x and y is 12."
c. it would display a very large number, something similar to 442152118.
d. the statement would cause a compilation error.
(note: this is for java programming)

1. D. 2*(3 + 4*5)

2. A. 100

3. B. It would display the text, "the sum of x and y is 12."

Explanation:

1.

Mathematical expressions are evaluated according to operator preference. The operator preference goes like as follows:

Thus in option D first 4*5 will be evaluated i.e. multiplication, after that 3 + 20 will be evaluated i.e. addition and finally 2*23 will be evaluated i.e. multiplication. Hence correct option is D.

2.

The execution of given statements will be as follows:

This is due to the use of post increment. In post increment the value of operator is incremented after the expression evaluation  is complete.  

Thus final value of j after execution of both statements will be 10 × 10 = 100. Hence correct option is A.

3.

The first two statement of code segment are used to assign the value of 1 and 2 to x and y respectively. The statement System.out.println(); function in Java is used to provide output on console.

The last statement will result in following output:

The sum of x and y is12.

Inside println() function any content  within double inverted commas ("") is present as it is on console. The part +x+y+ will be evaluated as 12 i.e. value of y written next to value of x.

In case it was written as +(x+y)+, it would have been  evaluated as 3 i.e. value of x + value of y.

Hence the correct option is B.

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answer; defense;