You are developing an application.
The application contains the following code segment (line numbers are included for
reference only):
When you run the code, you receive the following error message: “Cannot implicitly convert
type ‘object” to ‘inf. An explicit conversion exists (are you missing a cast?).”
You need to ensure that the code can be compiled.
Which code should you use to replace line 05?
A.
var2 = ((List<int>) array1) [0];
B.
var2 = array1[0].Equals(typeof(int));
C.
var2 = Convert.ToInt32(array1[0]);
D.
var2 = ((int[])array1)[0];
Explanation:
Make a list of integers of the array with = ( (List<int>)arrayl) then select the first item in the
list with [0].
Correct answer is C.
3
0
var2 = (int) array1[0];
var2 = array1.Cast().ToList()[0];
var2 = Convert.ToInt32(array1[0]);
3
0
The only answer that work here is C. var2 = Convert.ToInt32(array1[0]);
0
0
Or we can modify D with var2 = (int)array1[0];
0
0
C
0
0
C
or (int) array1[0];
0
0
(int)array1[0];
Convert.ToInt32(array1[0]);
array1.Cast<int>().ToList()[0];
answer: C
0
0
C
0
0
Answer C :
var2 = Convert.ToInt32(array1[0]);
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
namespace ConsoleApplication5
{
class Program
{
static void Main(string[] args)
{
ArrayList array1 = new ArrayList();
int var1 = 10;
int var2;
array1.Add(var1);
var2 = Convert.ToInt32(array1[0]);
Console.WriteLine(“var1 = {0} and var2 = {1}”
,var1
,var2);
Console.ReadLine();
}
}
}
0
0
C
I would like to know who prepared answer…. paranoia
0
0
Other comments are right; the actual answer (A) gives a “Cannot convert type ‘System.Collections.ArrayList’ to ‘System.Collections.Generic.List’.
Only good answer is C, that compiles perfectly fine.
0
0