commond版的obj-c helloworld

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xcode4.2

建项目的时候要选 foundation，不然没有Foundation包

注意看，这里不在需要手动写setUserName

要得到属性值的话，用self.****

main.m

#import <Foundation/Foundation.h>#import "Fraction.h"int main (int argc, const char * argv[]){    @autoreleasepool {                // insert code here...        //NSLog(@"Hello, World!");        // insert code here...        printf("Hello, World!\n");                Fraction *frac = [[Fraction alloc] init];        // set the values        [frac setUserName: @"mahone"];        //[frac setDenominator: 3];        // print it        printf( "The fraction is: " );        [frac print];            }       return 0;}

Fraction.h

#import <Foundation/Foundation.h>@interface Fraction : NSObject {    //NSInteger *numerator;    //NSInteger *denominator;    NSString *userName;}-(void) print;/*-(void) setNumerator: (int) d;-(void) setDenominator: (int) d;-(int) numerator;-(int) denominator;*///@property (nonatomic, copy) NSInteger *numerator;@property (nonatomic, copy) NSString *userName;@end

Fraction.m

#import "Fraction.h"#import <stdio.h>@implementation Fraction/*-(void) print {    printf( "%i/%i", numerator, denominator );}-(void) setNumerator: (int) n {    numerator = n;}-(void) setDenominator: (int) d {    denominator = d;}-(int) denominator {    return denominator;}-(int) numerator {    return numerator;}*/@synthesize userName = _userName;-(void) print {    NSString *nameString = self.userName;    if (nameString.length == 0) {        nameString = @"World";    }    NSString *greeting = [[NSString alloc] initWithFormat:@"Hello, %@!", nameString];    //NSLog(@"Hello, %@",nameString);    printf("%s\n" , [greeting UTF8String]);}@end

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