Go Language Operators
Operators are used to perform mathematical or logical operations in a running application.
Go operators are built into the language:
- Arithmetic operators
- Relational Operators
- Logical Operators
- Bitwise Operators
- Assignment Operators
- Other operators
Let's look at each in detail the operators introduced.
Arithmetic operators
The following table lists all languages Go arithmetic operators. Assume that A is 10, B is 20.
Operators | description | Examples |
---|---|---|
+ | Adding | A + B output 30 |
- | Subtraction | A - B output -10 |
* | Multiplied | A * B 200 output |
/ | Divided | B / A output 2 |
% | Remainder | B% A output 0 |
++ | Increment | A ++ output 11 |
- | Decrement | A-- output 9 |
The following example demonstrates the usage of various arithmetic operators:
package main import "fmt" func main() { var a int = 21 var b int = 10 var c int c = a + b fmt.Printf("第一行 - c 的值为 %d\n", c ) c = a - b fmt.Printf("第二行 - c 的值为 %d\n", c ) c = a * b fmt.Printf("第三行 - c 的值为 %d\n", c ) c = a / b fmt.Printf("第四行 - c 的值为 %d\n", c ) c = a % b fmt.Printf("第五行 - c 的值为 %d\n", c ) a++ fmt.Printf("第六行 - c 的值为 %d\n", a ) a-- fmt.Printf("第七行 - c 的值为 %d\n", a ) }
Examples of the above operating results:
第一行 - c 的值为 31 第二行 - c 的值为 11 第三行 - c 的值为 210 第四行 - c 的值为 2 第五行 - c 的值为 1 第六行 - c 的值为 22 第七行 - c 的值为 21
Relational Operators
The following table lists all of the Go language relational operators. Assume that A is 10, B is 20.
Operators | description | Examples |
---|---|---|
== | Check the two values are equal, equal returns True if otherwise False. | (A == B) is False |
! = | Check whether the two values are not equal, not equal returns True if otherwise False. | (A! = B) is True |
> | Check the left value is greater than the value of the right side, a return True otherwise False. | (A> B) is False |
< | Check the left value is less than the value of the right side, a return True otherwise False. | (A <B) is True |
> = | Check whether the value is greater than or equal to the left to the right value, it returns True if it is otherwise False. | (A> = B) is False |
<= | Check whether the value is less than or equal to the left to the right value, it returns True if it is otherwise False. | (A <= B) is True |
The following example demonstrates the usage of relational operators:
package main import "fmt" func main() { var a int = 21 var b int = 10 if( a == b ) { fmt.Printf("第一行 - a 等于 b\n" ) } else { fmt.Printf("第一行 - a 不等于 b\n" ) } if ( a < b ) { fmt.Printf("第二行 - a 小于 b\n" ) } else { fmt.Printf("第二行 - a 不小于 b\n" ) } if ( a > b ) { fmt.Printf("第三行 - a 大于 b\n" ) } else { fmt.Printf("第三行 - a 不大于 b\n" ) } /* Lets change value of a and b */ a = 5 b = 20 if ( a <= b ) { fmt.Printf("第四行 - a 小于等于 b\n" ) } if ( b >= a ) { fmt.Printf("第五行 - b 大于等于 b\n" ) } }
Examples of the above operating results:
第一行 - a 不等于 b 第二行 - a 不小于 b 第三行 - a 大于 b 第四行 - a 小于等于 b 第五行 - b 大于等于 b
Logical Operators
The following table lists all languages Go logical operators. Assume that A is True, B is False.
Operators | description | Examples |
---|---|---|
&& | Logical AND operator. If both sides of the operands are True, the condition is True, otherwise False. | (A && B) is False |
|| | Logical OR operator. If the operands on both sides there is a True, the condition is True, otherwise False. | (A || B) is True |
! | Logical NOT operator. If the condition is True, then the logical NOT condition False, otherwise True. | ! (A && B) is True |
The following example demonstrates the use of logical operators:
package main import "fmt" func main() { var a bool = true var b bool = false if ( a && b ) { fmt.Printf("第一行 - 条件为 true\n" ) } if ( a || b ) { fmt.Printf("第二行 - 条件为 true\n" ) } /* 修改 a 和 b 的值 */ a = false b = true if ( a && b ) { fmt.Printf("第三行 - 条件为 true\n" ) } else { fmt.Printf("第三行 - 条件为 false\n" ) } if ( !(a && b) ) { fmt.Printf("第四行 - 条件为 true\n" ) } }
Examples of the above operating results:
第二行 - 条件为 true 第三行 - 条件为 false 第四行 - 条件为 true
Bitwise Operators
Bitwise operators on integers in memory bits operate.
The following table lists the bitwise operators &, |, and ^ is calculated:
p | q | p & q | p | q | p ^ q |
---|---|---|---|---|
0 | 0 | 0 | 0 | 0 |
0 | 1 | 0 | 1 | 1 |
1 | 1 | 1 | 1 | 0 |
1 | 0 | 0 | 1 | 1 |
Assume that A = 60; B = 13; its binary number to:
A = 0011 1100 B = 0000 1101 ----------------- A&B = 0000 1100 A|B = 0011 1101 A^B = 0011 0001 ~A = 1100 0011
Bit computing support C language symbol shown in the following table. Assume that A is 60, B is 13:
Operators | description | Examples |
---|---|---|
& | Bitwise AND operator "&" is the binary operators. Its function is two binary numbers corresponding to each phase of the operation and participation. | (A & B) result is 12, the binary is 0000 1100 |
| | Bitwise OR operator "|" is a binary operator. Its function is to participate in the operation of two numbers each corresponding binary phase or | (A | B) the result is 61, the binary is 00111101 |
^ | Bitwise exclusive OR operator "^" is the binary operators. Its function is to participate in the operation of two numbers each corresponding binary XOR when two corresponding binary bit different and the result is 1. | (A ^ B) results for 49 binaries to 00,110,001 |
<< | Left shift operator "<<" is the binary operators. N-bit left shift is multiplied by 2 ^ n. Its function to each binary "<<" left of the left operand of all a number of bits specified by the number "<<" right of the decimal moves, discarding the high and lower 0s. | A << 2 results for 240 binary is 11110000 |
>> | Right shift operator ">>" are binary operators. Right by n bits is divided by 2 ^ n. Its function is to various binary ">>" the left operand Several all right, ">>" on the right the number of bits specified. | A >> 2 results for 15 0000 1111 binary system |
The following example demonstrates the use of logical operators:
package main import "fmt" func main() { var a uint = 60 /* 60 = 0011 1100 */ var b uint = 13 /* 13 = 0000 1101 */ var c uint = 0 c = a & b /* 12 = 0000 1100 */ fmt.Printf("第一行 - c 的值为 %d\n", c ) c = a | b /* 61 = 0011 1101 */ fmt.Printf("第二行 - c 的值为 %d\n", c ) c = a ^ b /* 49 = 0011 0001 */ fmt.Printf("第三行 - c 的值为 %d\n", c ) c = a << 2 /* 240 = 1111 0000 */ fmt.Printf("第四行 - c 的值为 %d\n", c ) c = a >> 2 /* 15 = 0000 1111 */ fmt.Printf("第五行 - c 的值为 %d\n", c ) }
Examples of the above operating results:
第一行 - c 的值为 12 第二行 - c 的值为 61 第三行 - c 的值为 49 第四行 - c 的值为 240 第五行 - c 的值为 15
Assignment Operators
The following table lists all of the Go language assignment operator.
Operators | description | Examples |
---|---|---|
= | Simple assignment operator assigns a value expression of an lvalue | C = A + B A + B will be assigned to the C expression result |
+ = | Added together before assignment | C + = A is equal to C = C + A |
- = | After subtraction assignment | C - = A is equal to C = C - A |
* = | Then multiplying the assignment | C * = A is equal to C = C * A |
/ = | Division after assignment | C / = A is equal to C = C / A |
% = | Remainder after assignment | C% = A is equal to C = C% A |
<< = | Left after assignment | C << = 2 equal to C = C << 2 |
>> = | Right after the assignment | C >> = 2 equal to C = C >> 2 |
& = | Bitwise AND assignment after | C & = 2 equal to C = C & 2 |
^ = | After pressing the bit XOR assignment | C ^ = 2 equal to C = C ^ 2 |
| = | After pressing position or assignment | C | = 2 is equal to C = C | 2 |
The following example demonstrates the assignment operator usage:
package main import "fmt" func main() { var a int = 21 var c int c = a fmt.Printf("第 1 行 - = 运算符实例,c 值为 = %d\n", c ) c += a fmt.Printf("第 2 行 - += 运算符实例,c 值为 = %d\n", c ) c -= a fmt.Printf("第 3 行 - -= 运算符实例,c 值为 = %d\n", c ) c *= a fmt.Printf("第 4 行 - *= 运算符实例,c 值为 = %d\n", c ) c /= a fmt.Printf("第 5 行 - /= 运算符实例,c 值为 = %d\n", c ) c = 200; c <<= 2 fmt.Printf("第 6行 - <<= 运算符实例,c 值为 = %d\n", c ) c >>= 2 fmt.Printf("第 7 行 - >>= 运算符实例,c 值为 = %d\n", c ) c &= 2 fmt.Printf("第 8 行 - &= 运算符实例,c 值为 = %d\n", c ) c ^= 2 fmt.Printf("第 9 行 - ^= 运算符实例,c 值为 = %d\n", c ) c |= 2 fmt.Printf("第 10 行 - |= 运算符实例,c 值为 = %d\n", c ) }
Examples of the above operating results:
第 1 行 - = 运算符实例,c 值为 = 21 第 2 行 - += 运算符实例,c 值为 = 42 第 3 行 - -= 运算符实例,c 值为 = 21 第 4 行 - *= 运算符实例,c 值为 = 441 第 5 行 - /= 运算符实例,c 值为 = 21 第 6行 - <<= 运算符实例,c 值为 = 800 第 7 行 - >>= 运算符实例,c 值为 = 200 第 8 行 - &= 运算符实例,c 值为 = 0 第 9 行 - ^= 运算符实例,c 值为 = 2 第 10 行 - |= 运算符实例,c 值为 = 2
Other operators
The following table lists the other operators Go language.
Operators | description | Examples |
---|---|---|
& | Return variable memory address | & A; will give the real address of the variable. |
* | Pointer variable. | * A; is a pointer variable |
The following example demonstrates the usage of other operators:
package main import "fmt" func main() { var a int = 4 var b int32 var c float32 var ptr *int /* 运算符实例 */ fmt.Printf("第 1 行 - a 变量类型为 = %T\n", a ); fmt.Printf("第 2 行 - b 变量类型为 = %T\n", b ); fmt.Printf("第 3 行 - c 变量类型为 = %T\n", c ); /* & 和 * 运算符实例 */ ptr = &a /* 'ptr' 包含了 'a' 变量的地址 */ fmt.Printf("a 的值为 %d\n", a); fmt.Printf("*ptr 为 %d\n", *ptr); }
Examples of the above operating results:
第 1 行 - a 变量类型为 = int 第 2 行 - b 变量类型为 = int32 第 3 行 - c 变量类型为 = float32 a 的值为 4 *ptr 为 4
Operator Precedence
Some operators have a higher priority, binary operators are operational direction from left to right. The following table lists all the operators and their priorities, representatives from top to bottom in descending priority:
priority | Operators |
---|---|
7 | ^! |
6 | * /% ^ & << >> & |
5 | + - | ^ |
4 | ==! = <<=> => |
3 | <- |
2 | && |
1 | || |
Of course, you can use parentheses to temporarily improve the overall priority of the operation of an expression.
Examples of the above operating results:
package main import "fmt" func main() { var a int = 20 var b int = 10 var c int = 15 var d int = 5 var e int; e = (a + b) * c / d; // ( 30 * 15 ) / 5 fmt.Printf("(a + b) * c / d 的值为 : %d\n", e ); e = ((a + b) * c) / d; // (30 * 15 ) / 5 fmt.Printf("((a + b) * c) / d 的值为 : %d\n" , e ); e = (a + b) * (c / d); // (30) * (15/5) fmt.Printf("(a + b) * (c / d) 的值为 : %d\n", e ); e = a + (b * c) / d; // 20 + (150/5) fmt.Printf("a + (b * c) / d 的值为 : %d\n" , e ); }
Examples of the above operating results:
(a + b) * c / d 的值为 : 90 ((a + b) * c) / d 的值为 : 90 (a + b) * (c / d) 的值为 : 90 a + (b * c) / d 的值为 : 50