冒泡排序

今天去面试被坑了，然后这个发一下吧。

NSMutableArray * array = [NSMutableArray arrayWithObjects: @"1",@"8",@"2",@"7",@"2",@"5",@"9",nil];

//选择

for (int  i =0; i<[array count]-1; i++) {

for (int j = i+1; j<[array count]; j++) {

if ([array[i] intValue]>[array[j] intValue]) {

//交换

[array exchangeObjectAtIndex:i withObjectAtIndex:j];

}

}

}

NSLog(@"%@",array);