Operators textbook series (a) - Java arithmetic operator
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Arithmetic operator
substantially are:
± * /%
Increment decrement
++ - -
Step 1: Basic arithmetic operator
Step 2: Practice - summing
Step 3: Answer - summing
Step 4: calculation means exceeds an arbitrary length int
Step 5: calculation means is less than the length of any int
step 6:% modulus
step 7: increment decrement
step 8: Save increment from before and after the operator facing opposing differences
step 9: exercise - increment
step 10: the answer - increment
Example 1: Basic arithmetic operator
± * /
Basic Math
public class HelloWorld {
public static void main(String[] args) {
int i = 10;
int j = 5;
int a = i+j;
int b = i - j;
int c = i*j;
int d = i /j;
}
}
Example 4: computing means exceeds an arbitrary length int
If any arithmetic unit having a length of more than int, then the calculation result is calculated according to the length of the longest
such
int. 5 = A;
long. 6 = B;
A + B -> the result is a long type
public class HelloWorld {
public static void main(String[] args) {
int a = 5;
long b = 6;
int c = (int) (a+b); //a+b的运算结果是long型，所以要进行强制转换
long d = a+b;
}
}
Example 5: calculation means is smaller than the arbitrary length int
If any arithmetic unit length does not exceed int, then the calculation result is calculated according int
byte. 1 = A;
byte B = 2;
A + B -> int type
public class HelloWorld {
public static void main(String[] args) {
byte a = 1;
byte b= 2;
byte c = (byte) (a+b); //虽然a b都是byte类型，但是运算结果是int类型，需要进行强制转换
int d = a+b;
}
}
Example 6:% modulus
% fetch I, also known as modulo
5 is divided by 2, I 1
public class HelloWorld {
public static void main(String[] args) {
int i = 5;
int j = 2;
System.out.println(i%j); //输出为1
}
}
Example 7: increment decrement
++
An increase or decrease on the basis of the original 1
public class HelloWorld {
public static void main(String[] args) {
int i = 5;
i++;
System.out.println(i);//输出为6
}
}
Example 8: Save increment from the difference before and after the operator set the counter
to + Example
int. 5 = I;
I ++; the first value, and then calculating
++ I; the first operation, and then the values
public class HelloWorld {
public static void main(String[] args) {
int i = 5;
System.out.println(i++); //输出5
System.out.println(i); //输出6
int j = 5;
System.out.println(++j); //输出6
System.out.println(j); //输出6
}
}
