下表列出了所有支持Objective-C语言的算术运算符。假设变量A=10和变量B=20，则：
| 运算符 | 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 |
尝试下面的例子就明白了在Objective-C编程语言的所有算术运算符：
#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 );
}
当编译和执行上述程序，它会产生以下结果：
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
