oc_study10

//内容：     类方法的学习//作者：     sekey//日期：     2015.3.10//设计一个计算器类//＊求和//＊求平均值#import <Foundation/Foundation.h>@interface Calculator : NSObject//类方法都以加号＋开头//对象方法以－开头+ (int)sumofNum1:(int)num1 andNum2:(int)num2;+ (int)avgofNum1:(int)num1 andNum2:(int)num2;@end@implementation Calculator+ (int)sumofNum1:(int)num1 andNum2:(int)num2{    return num1 + num2;}+ (int)avgofNum1:(int)num1 andNum2:(int)num2{    return [Calculator sumofNum1:10 andNum2:15]/2;}@endint main(void){    NSLog(@"类方法求和sum ＝ %i", [Calculator sumofNum1:10 andNum2:15]);    NSLog(@"类方法求和sum ＝ %i", [Calculator avgofNum1:10 andNum2:15]);    return 0;}