简单的算法－－－冒泡排序

刚开始学习算法，写了个小小的Demo，如有不好的地方欢迎大家多多指教！

NSMutableArray *array = [
NSMutableArray arrayWithObjects:@"12",@"12",@"99",@"76",@"76",
nil];

for (
int i = 4; i >=
0; i --) {
for (
int j = 0; j < i ; j ++ ) {
int a = [[ array
objectAtIndex: j ] intValue];
int b = [[array
objectAtIndex: (j + 1)]
intValue ] ;
int temp =
0;

if (a <= b) {
temp = b ;
b = a ;
a = temp ;

[ array replaceObjectAtIndex:j
withObject:[ NSNumber
numberWithInt:a]] ;
[ array replaceObjectAtIndex:(j +
1) withObject:[
NSNumber numberWithInt:b]] ;
}
}
}

for (int i =
0; i < array.count; i ++) {
NSLog(@"%@", [array
objectAtIndex:i]) ;
}