OC中的基本冒泡排序

   NSMutable *a=[NSMutableArray arrayWithObjects:@"5",@"7",@"99",@"479",@"712",nil];

for (int i=0, i<a.count,i++){

for (int j=0, j<a.count-1,j++){

if ( [a[j]intValue]>[a[j+1]intValue]){

[a exchangeObjectAtIndex:j withObjectAtIndex:j+1];

}

}

NSLog(@"a=%@",a[i]);

}