Object-C 基础学习笔记（for，foreach，while，switch）

int main(int argc, const char * argv[]) {
    //for,foreach,while,do-while,switch

    NSMutableArray* mutableArray = [NSMutableArray arrayWithCapacity:2];

    [mutableArray addObject:@"item1"];
    [mutableArray addObject:@"item2"];
    [mutableArray addObject:@"item3"];

    NSLog(@"-------------------for---------------------");
    for(NSUInteger i=0;i<[mutableArray count];i++)
    {
        NSLog(@"%@",[mutableArray objectAtIndex:i]);
    }

    NSLog(@"-------------------foreach---------------------");

    for (id item in mutableArray) {
        NSLog(@"%@",item);
    }

    NSLog(@"-------------------while---------------------");

    NSUInteger count = 0;
    while (count < [mutableArray count]) {
        NSLog(@"%@",[mutableArray objectAtIndex:count]);
        count++;
    }

    NSLog(@"-------------------do-while---------------------");
    count = 0;
    do{
        NSLog(@"%@",[mutableArray objectAtIndex:count]);
        count++;
    }while (count<[mutableArray count]);

    NSLog(@"-------------------switch---------------------");
    int expression=4;
    switch (expression) {
        case 1:
            NSLog(@"expression=1");
            break;
        case 2:
            NSLog(@"expression=2");
            break;
        default:
            NSLog(@"expression=default");
            break;
    }

    return 0;
}