Given the following variables declarations: in num 1 = 10, num2 = 20, newNum = 3

Question

Given the following variables declarations: in num 1 = 10, num2 = 20, newNum = 30; double x = 5.0 y = 8.0; Determine which of the following assignment statements are valid. For each invalid statement, explain why it is invalid. Assume that each statements immediately follows the above variable declarations. Num1 = 15; num2 = num 1 - 18; num 1 = 5; num2 = 2 + 6; num 1 = num2/3; num 1 + num 2 = newNum; x = 12 * num1 - 15.3; num 1 * 2 = newNum; x / y = x * y; num2 = num 1 % 2.0; newNum = static_cast(x) % s; x = x + 5; newNum = num1 + static_cast (4.6/2);

Explanation / Answer

a) Valid. num1 gets overwritten by new value i.e., 15 replaces 20. b) Valid as num2 = -8 now. c) Invalid. Reason being num1 = num2/3 but num2 = 2+6 = 8 and num1 = 8/3 which is a float value but num1 was declared as int. d) Invalid. num1+num2 is a value and newNum is also a value. You cannot assign a value to a value. You can assign a value to a variable. e) Valid f) Invalid as again a value is being assigned to a value. g) Invalid as again a value being assigned to a value (constant cannot change its value) h) Invalid as num2 will get a float value(since num1%2.0 will return float) but it was declared as int. i) Valid since x has been type casted from double to int and remainder will also be int. j) valid as x is still double. k)Valid as newNum gets a int value because num1 + int(4.6/2) = num1 + int(2.3) = num1 + 2 = 10 +2 = 12;

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