iosOC/C不可变数组排序

//1.回顾C数组排序

int a[6] = {1,4,3,5,6,2};

//选择

for (int i =0; i<6-1; i++) {

for (int j = i+1; j<6;j++) {

if(a[i]>a[j]){

int tmp = a[i];

a[i] = a[j];

a[j] = tmp;

}

}

}

for(int i=0;i<6;i++){

printf("a[%d] = %d\n",i,a[i]);

}

//NSArray 排序

NSArray * array = @[@"1",@"4",@"5",@"7",@"2",@"9"];

//当前放返回值是数组,这个排序是系统默认提供,遵从从小大 具有局限性 不方便扩展 不会经常使用

[array sortedArrayUsingSelector:@selector(compare:)];

//    [array sortedArrayWithOptions:<#(NSSortOptions)#> usingComparator:<#^NSComparisonResult(id obj1, id obj2)cmptr#>]

//      [array sortedArrayUsingFunction:<#(NSInteger (*)(__strong id, __strong id, void *))#> context:<#(void *)#>]

NSMutableArray * arr2 = [[NSMutableArray alloc]initWithArray:array];

for (int i = 0; i<[arr2 count]-1; i++) {

for (int j = i+1; j<[arr2 count]; j++) {

if(([arr2[i] intValue])>([arr2[j] intValue])){

NSString * str = arr2[i];

arr2[i] = arr2[j];

arr2[j] = str;

}

}

}

NSLog(@"%@",arr2);