Objective-C 算術運算符

下表列出了所有支持Objective-C語言的算術運算符。假設變量A=10和變量B=20，則：

運算符

描述

示例

+

Adds two operands

A + B = 30

-

Subtracts second operand from the first

A - B = -10

*

Multiplies both operands

A * B = 200

/

Divides numerator by denominator

B / A = 2

%

Modulus Operator and remainder of after an integer division

B % A = 0

++

Increments operator increases integer value by one

A++ = 11

--

Decrements operator decreases integer value by one

A-- = 9

例子

嘗試下面的例子就明白了在Objective-C編程語言的所有算術運算符：

#import <Foundation/Foundation.h> main() { int a = 21; int b = 10; int c ; c = a + b; NSLog(@"Line 1 - Value of c is %d
", c ); c = a - b; NSLog(@"Line 2 - Value of c is %d
", c ); c = a * b; NSLog(@"Line 3 - Value of c is %d
", c ); c = a / b; NSLog(@"Line 4 - Value of c is %d
", c ); c = a % b; NSLog(@"Line 5 - Value of c is %d
", c ); c = a++; NSLog(@"Line 6 - Value of c is %d
", c ); c = a--; NSLog(@"Line 7 - Value of c is %d
", c ); }

當編譯和執行上述程序，它會產生以下結果：

2013-09-07 22:10:27.005 demo[25774] Line 1 - Value of c is 31
2013-09-07 22:10:27.005 demo[25774] Line 2 - Value of c is 11
2013-09-07 22:10:27.005 demo[25774] Line 3 - Value of c is 210
2013-09-07 22:10:27.005 demo[25774] Line 4 - Value of c is 2
2013-09-07 22:10:27.005 demo[25774] Line 5 - Value of c is 1
2013-09-07 22:10:27.005 demo[25774] Line 6 - Value of c is 21
2013-09-07 22:10:27.005 demo[25774] Line 7 - Value of c is 22