This section on C++ test on “Grouping of Exceptions”. One shall practice these test questions to improve their C++ programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C++ programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C++ test questions come with detailed explanation of the answers which helps in better understanding of C++ concepts.
Here is a listing of C++ test questions on “Grouping of Exceptions” along with answers, explanations and/or solutions:
1. How many types of exception handling are there in c++?
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: There are two types of exception handling in c++. They are synchronous exception handling and asynchronous exception handling.
2. How many runtime error messages associated with exception?
a) 2
b) 4
c) 5
d) infinite
Answer: b
Clarification: There are four runtime error messages associated with exceptions. They are overflow_error, range_error, system_error and underflow_error.
3. Which block should be placed after try block?
a) catch
b) throw
c) either catch or throw
d) handler
Answer: a
Clarification: Syntax of try catch block:
try{
// do something
}
catch{
// catch respective error.
}
finally{
// do something after trying or catching error i.e. run this block in both cases.
}
4. What will be the output of the following C++ code?
-
#include
-
using namespace std;
-
int main()
-
{
-
double a = 10, b = 5, res;
-
char Operator = '/';
-
try
-
{
-
if (b == 0)
-
throw "Division by zero not allowed";
-
res = a / b;
-
cout << a << " / " << b << " = " << res;
-
}
-
catch(const char* Str)
-
{
-
cout << "n Bad Operator: " << Str;
-
}
-
return 0;
-
}
a) 10
b) 2
c) Bad Operator
d) 10 / 5 = 2
Answer: d
Clarification: In this program, We are dividing the two variables and printing the result. If any one of the operator is zero means, it will arise a exception.
Output:
$ g++ gex.cpp
$ a.out
10 / 5 =2
5. What will be the output of the following C++ code?
-
#include
-
using namespace std;
-
int main()
-
{
-
try
-
{
-
throw 1;
-
}
-
catch (int a)
-
{
-
cout << "exception number: " << a << endl;
-
return 0;
-
}
-
cout << "No exception " << endl;
-
return 0;
-
}
a) No exception
b) exception number
c) exception number: 1
d) exception number: 5
Answer: c
Clarification: If we caught a integer value means, there will be an exception, if it is not a integer, there will not be a exception.
Output:
$ g++ gex1.cpp
$ a.out
exception number: 1
6. What will be the output of the following C++ code?
-
#include
-
using namespace std;
-
int main()
-
{
-
int a = 10, b = 20, c = 30;
-
float d;
-
try
-
{
-
if ((a - b) != 0)
-
{
-
d = c / (a - b);
-
cout << d;
-
}
-
else
-
{
-
throw(a - b);
-
}
-
}
-
catch (int i)
-
{
-
cout<<"Answer is infinite "<<i;
-
}
-
}
a) 10
b) -3
c) 15
d) 17
Answer: b
Clarification: We are manipulating the values, if there is any infinite value means, it will raise an exception.
Output:
$ g++ gex2.cpp
$ a.out
-3
7. What will be the output of the following C++ code?
-
#include
-
using namespace std;
-
void test(int x)
-
{
-
try
-
{
-
if (x > 0)
-
throw x;
-
else
-
throw 'x';
-
}
-
catch(int x)
-
{
-
cout<<"integer:"<<x;
-
}
-
catch(char x)
-
{
-
cout << "character:" << x;
-
}
-
}
-
int main()
-
{
-
test(10);
-
test(0);
-
}
a) integer:10character:x
b) integer:10
c) character:x
d) character:10
Answer: a
Clarification: We are passing the integer and character and catching it by using multiple catch statement.
Output:
$ g++ gex3.cpp
$ a.out
integer:10character:x
8. What will be the output of the following C++ code?
-
#include
-
using namespace std;
-
void PrintSequence(int StopNum)
-
{
-
int Num;
-
Num = 1;
-
while (true)
-
{
-
if (Num >= StopNum)
-
throw Num;
-
cout << Num << endl;
-
Num++;
-
}
-
}
-
int main(void)
-
{
-
try
-
{
-
PrintSequence(2);
-
}
-
catch(int ExNum)
-
{
-
cout << "exception: " << ExNum << endl;
-
}
-
return 0;
-
}
a) 1
b) exception: 2
c)
1
exception: 2
d) exception: 4
Answer: c
Clarification: In this program, We are printing one and raising a exception at 2.
Output:
$ g++ gex4.cpp
$ a.out
1
exception: 2
9. Pick out the correct answer.
a) Exceptions are not suitable for critical points in code
b) Exception are suitable for critical points in code
c) Exceptions are used when postconditions of a function cannot be satisfied
d) Throw block should be placed after try block
Answer: a
Clarification: If there is many number of exceptions in the program means, We have to use multiple catch statement and it is hard to keep track of the program.
10. When exceptions are used?
a) To preserve the program
b) Exceptions are used when postconditions of a function cannot be satisfied
c) Exceptions are used when postconditions of a function can be satisfied
d) Exceptions are used when preconditions of a function cannot be satisfied
Answer: c
Clarification: Exceptions are used when postconditions of a function can be satisfied.
