Example - 1

In the following Java example, a float literal is cast to an integer, thus causing a loss of precision.

int i = (int) 33457.8f;

Example - 2

This code adds a float and an integer together, casting the result to an integer.

$floatVal = 1.8345;$intVal = 3;$result = (int)$floatVal + $intVal;

Normally, PHP will preserve the precision of this operation, making $result = 4.8345. After the cast to int, it is reasonable to expect PHP to follow rounding convention and set $result = 5. However, the explicit cast to int always rounds DOWN, so the final value of $result is 4. This behavior may have unintended consequences.

Example - 3

In this example the variable amount can hold a negative value when it is returned. Because the function is declared to return an unsigned int, amount will be implicitly converted to unsigned.

int amount = 0;...if (result == ERROR)amount = -1;...return amount;unsigned int readdata () {}

If the error condition in the code above is met, then the return value of readdata() will be 4,294,967,295 on a system that uses 32-bit integers.

Example - 4

In this example, depending on the return value of accecssmainframe(), the variable amount can hold a negative value when it is returned. Because the function is declared to return an unsigned value, amount will be implicitly cast to an unsigned number.

int amount = 0;...amount = accessmainframe();...return amount;unsigned int readdata () {}

If the return value of accessmainframe() is -1, then the return value of readdata() will be 4,294,967,295 on a system that uses 32-bit integers.