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Math APIs

Math API Methods

| Min and Max | Round | Ceil And Floor |
| Exponents | Random | |

min() and max()

  • you can compare all types of numbers, but be aware of autocasting
long a = 5; 
int b = 3; 
int c = Math.max(a, b);

int c = Math.max(a, b); //OK => 5

int d = (int) Math.max(a, b); //NOK, DOES NOT COMPILE

round()

  • takes decimal number and returns integral number
  • if parameter is float, return type will be int
  • if parameter is double, return type will be long
double d = 2.56; 
long a = Math.round(d); 
 // => 3

int b = Math.round(d);//OK 
int c = (int) Math.round(d); //NOK, DOES NOT COMPILE
 // => 3

ceil() and floor()

  • take any number and always returns double
double r = Math.ceil(2.45); 
 // => 3.0 
double p = Math.floor(2.45); 
 // => 2.0 
double q = Math.floor(2.99); 
 // => 2.0

exponents: pow()

  • takes any number, returns double
double p = Math.pow(2, 5); 
 // => 32.0 
double q = Math.pow(25, 0.5); 
 // => 5.0

random()

double ran = Math.random();
// => random number between 0 and 1.0 (not included)

Random Number Limit

private final Random rand = new Random();

public int randomIntNum(){
    int min = 50;
    int max = 100;
    return  rand.nextInt(max - min + 1) + min;
}