Page 101 - AP Computer Science A, 7th edition

of memory set aside for their storage, however, integers are bounded. If you try to store a value whose magnitude is too big in an int variable, you’ll get an overflow error. (Java gives you no warning. You just get a wrong result!)
An identifier, for example a variable, is introduced into a Java program with a declaration that specifies its type. A variable is often initialized in its declaration. Some examples follow:
int x;
double y,z;
boolean found;
int count = 1;
to 1
double p = 2.3, q = 4.1; 2.3 and 4.1
//count initialized //p and q initialized to
One type can be cast to another compatible type if appropriate. For example,
int total, n; double average;
...
Alternatively,
average = total/(double) n;
Assigning an int to a double automatically casts the int to
double. For example, int num = 5;
double realNum = num; //num is cast to double Assigning a double to an int without a cast, however, causes a
compile-time error. For example,
average = (double) total/n; to ensure
double x = 6.79;
//total cast to double //real division is used