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

例子

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