Converting Data Types

Sometimes we need to convert from one data type to another. For example, math operations cannot be performed on Strings. To convert data types we can use the following:

• Change String s to an integer

• Change String s to an integer

• Change double x2 to an integer

Example:

String num = "50"; 
int x; 
double y = 25.2; 

Arithmetic Operations

Arithmetic operations in Java follow the order of operations. Math calculations on integers and floating point numbers can be performed using the following operators:

Math.pow() Exponent

/ Division

% Modulus

* Multiplication

+ Addition

- Subtraction

Writing Code

Tracing through code by hand is a useful technique to help find errors in your code. If the value of a variable changes, write the new value in that variable’s column.

Use the following chart to trace the given java code.

int x = 2; 
int y = 5 * 3;
int y = 5 * 3;
int y = 5 * 3;
int y = 5 * 3;
x = (int) Math.pow(y, 2); 
num = "5"; 
System.out.print(num + 2); 
System.out.print(Integer.parseInt(num)+2);
y = y + x;