Exercises
1. State, in your own words, the meaning of the following terms:
a) reserved keywords b) declaration of a variable
c) initializing a variable d) assignment operator
e) order of precedence f) basic arithmetic operators
g) Java rounding functions h) Java trig functions
i) ++, --, +=, *=, /=, -=, %= j) Java math constants
k) boolean operators l) comparison operators
2. Describe, in your own words:
a) how variable names can look like, and how variable names should look like
b) which side of an assignment is evaluated first
c) what the "percent" operator % does
d) what the resulting type is when dividing two int, or an int and a double, or two
double
e) what the resulting type is when adding two int, or an int and a double, or two
double
3. What is the exact syntax to:
a) declare one variable of type double
b) declare several variables of type double in one line
c) declare one variable of type double and assign the value –17.3 to it at the same
time
d) declare several variables of type double and assign values to them at the same time
4. What is the compiler error message, if any, if you
a) assign an int value to a double variable, or a double value to an int variable
b) assign a char value to an int variable, or an int value to a char variable
c) if you assign a numeric value to a boolean variable, or a boolean value to a numeric
variable
5. Is the following code fragment legal? Why or why not?
int package = 10;
Is the following code fragment legal? Why or why not?
int Package = 10;
6. What is the value of z at the end of this code fragment?
int z = 3;
int x = 7, y = 5;
x *= y;
y /= 2;
x++;
z += (x + y);
7. Determine if the following statements are true or false, using:
