**面试的时候很多公司会要求写一个冒泡排序算法，于是用OC写了一个，代码如下所示

需要注意的事项：oc数组只能存放oc对象，因此遍历数组输出的时候，记得通过NSString对象转换成intValue**

#import <Foundation/Foundation.h>

   void bubleSort(NSMutableArray *numbers){
   int i,j,count= (int)[numbers count];

   for (i = 0; i < count; i++) {
      for (j = i+1; j<count; j++) {
         int a = [[numbers objectAtIndex:i] intValue];
         int b = [[numbers objectAtIndex:j] intValue];
        
         if (a>b) { //从小到大
             [numbers replaceObjectAtIndex:i withObject:[NSString stringWithFormat:@"%d",b]];
             [numbers replaceObjectAtIndex:j withObject:[NSString stringWithFormat:@"%d",a]];
          }
       }
    }

   for (NSString *num in numbers) {
         NSLog(@"%d",[num intValue]);
    }
 }


int main(int argc, const char * argv[]) {
    @autoreleasepool {
         NSMutableArray *p = [[NSMutableArray alloc] initWithObjects:@"3",@"6",@"4",@"5",@"1",@"2", nil];
        bubleSort(p);
     }
   return 0;
}