1 - Which of the following will run? 2- If some statement that may crash in fact
ID: 3876707 • Letter: 1
Question
1 -
Which of the following will run?
2-
If some statement that may crash in fact crashes, which of the following will display what the error was that was thrown?
3
int[] mynumbers = {1,3,5,88}; for (int i = 1 ; i <= mynumbers.Length; i++){ mynumbers[i] = 15; }
int[] mynumbers = {1,3,5,88}; for (int i = mynumbers.Length-1 ; i >= 0; i--){ mynumbers[i] = 15; }
int[] mynumbers = {1,3,5,88}; ....
foreach (int j in mynumbers){ j = 15;
}
int[] mynumbers = {1,3,5,88}; for (int i = 1 ; i <= mynumbers.Length; i++){ mynumbers[i] = "hello world"; }
2-
If some statement that may crash in fact crashes, which of the following will display what the error was that was thrown?
try
{ // some statement that may crash
}
catch
{ MessageBox.Show(ex.Message);
}
try
{ // some statement that may crash
}
finally (Exception ex)
{ MessageBox.Show(ex.Message);
}
try
{ // some statement that may crash
}
catch (Exception ex)
{ MessageBox.Show(ex.Message);
}
if( // some statement that may crash){ catch (Exception ex); MessageBox.Show(ex.Message); }
3
Explanation / Answer
1.
Which of the following will run? => Option B will run
int[] mynumbers = {1,3,5,88};
for (int i = 1 ; i <= mynumbers.Length; i++){ mynumbers[i] = 15;
}
== Will not run.. because i varies from 1 to 4, while numbers[4] will give an Array out of bound exception.
int[] mynumbers = {1,3,5,88};
for (int i = mynumbers.Length-1 ; i >= 0; i--){
mynumbers[i] = 15;
}
== Runs fine, as index varies only from 3 to 0.
int[] mynumbers = {1,3,5,88};
....
foreach (int j in mynumbers){
j = 15;
}
== incorrect syntax, foreach loop keyword in for only.
int[] mynumbers = {1,3,5,88};
for (int i = 1 ; i <= mynumbers.Length; i++){
mynumbers[i] = "hello world";
}
== mynumbers is integer, can not accomodate string
===================================================================================
2. Option C is correct
try
{
// some statement that may crash
}
catch
{
MessageBox.Show(ex.Message);
}
== incorrect, as catch doesn't specify any argument
try
{
// some statement that may crash
}
finally (Exception ex)
{
MessageBox.Show(ex.Message);
}
== incorrect, finally can't specify any argument
try
{
// some statement that may crash
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
== Correct, catch block catches any exception and shows it correctly.
if( // some statement that may crash){
catch (Exception ex);
MessageBox.Show(ex.Message);
}
== incorrect, catch must preceed with a try block.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.