C++ Programming Multiple Choice Questions & Answers (MCQs) focuses on “Function Templates – 2”.
Q 1. What are Templates in C++?
A. A feature that allows the programmer to write generic programs
B. A feature that allows the programmer to write specific codes for a problem
C. A feature that allows the programmer to make program modular
D. A feature that does not add any power to the language
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Answer:-A. A feature that allows the programmer to write generic programsExplanation
Templates are features in C++ that allows the programmer to write generic programs. for example, making the same function to take different types of arguments and perform the same action on them without specifying the type in the argument list.
Q 2. In how many ways templates concept can be used?
A. 1
B. 2
C. 3
D. 4
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Answer:-B. 2Explanation
Template concept can be used in two different ways. They are function templates used with functions and class templates used with classes.
Q 3. What is the difference between normal function and template function?
A. The normal function works with any data types whereas template function works with specific types only
B. Template function works with any data types whereas normal function works with specific types only
C. Unlike a normal function, the template function accepts a single parameter
D. Unlike the template function, the normal function accepts more than one parameters
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Answer:-B. Template function works with any data types whereas normal function works with specific types onlyExplanation
As a template feature allows you to write generic programs. therefore a template function works with any type of data whereas normal function works with the specific types mentioned while writing a program. Both normal and template function accepts any number of parameters.Q 4. Templates simulate which of the following feature?
A. Polymorphism
B. Abstraction
C. Encapsulation
D. Inheritance
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Answer:-A. PolymorphismExplanation
Template function helps in writing functions that work with different types of parameters which is what polymorphism means i.e. using same function prototype to perform the same operations on different types of parameters.
Q 5. Which keyword is used for the template?
A. Template
B. template
C. Temp
D. temp
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Answer:-B. templateExplanation
C++ uses template reserved keyword for defining templates.Q 6. What is the correct syntax of defining function template/template functions?
A. template <class T> void(T a){cout<<a;}
B. Template <class T> void(T a){cout<<a;}
C. template <T> void(T a){cout<<a;}
D. Template <T> void(T a){cout<<a;}
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Answer:-A. templateExplanation
Starts with keyword template and then
Q 7. What does this template function indicates?
==================
template<class T>
void func(T a)
{
cout<<a;
}
==================
A. A function taking a single generic parameter and returning a generic type
B. A function taking a single generic parameter and returning nothing
C. A function taking single int parameter and returning a generic type
D. A function taking a single generic parameter and returning a specific non-void type
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Answer:-B. A function taking a single generic parameter and returning nothingExplanation
As the return type of function is void therefore function is not returning anything. Now as the function is taking a template T as its argument which is a general type, therefore, it is accepting a single general type argument.
Q 8. What does this template function indicates?
==================
template<class T>
T func(T a)
{
cout<<a;
}
==================
A. A function taking a single generic parameter and returning a generic type
B. A function taking a single generic parameter and returning nothing
C. A function taking single int parameter and returning a generic type
D. A function taking a single generic parameter and returning a specific non-void type
Show Answer
Answer:-A. A function taking a single generic parameter and returning a generic typeExplanation
As the return type of function is template T, therefore, the function is returning a general type. Now as the function is taking a template T as its argument which is a general type, therefore, it is accepting a single general type argument.
Q 9. What does this template function indicates?
==================
template<class T, class U>
U func(T a, U b)
{
cout<<a<<“\t”<<b;
}
==================
A. A function taking a single generic parameter and returning a generic type which may be different from argument type
B. A function taking a single generic parameter and returning a generic type which must be different from argument type
C. A function taking a single generic parameter and returning a generic type which must have the same type as argument type
D. A function taking a single generic parameter and returning a specific non-void type
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Answer:- A. A function taking a single generic parameter and returning a generic type which may be different from argument typeExplanation
As the return type of function is template U, therefore, the function is returning a general type. Now as the function is taking a template T as its argument which is a general type, therefore, it is accepting a single general type argument. But as U and T are different therefore return type and argument type may be the same or different. Same if U and T both have the same type and different if both have different types.
Q 10. What will be the output of the following C++ code?
#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
template<class T>
T func(T a)
{
cout<<a;
return a;
}
template<class U>
void func(U a)
{
cout<<a;
}
int main(int argc, char const *argv[])
{
int a = 5;
int b = func(a);
return 0;
}
A. 5
B. 55
C. Error
D. Segmentation fault
Show Answer
Answer:-C. ErrorExplanation
Template function cannot be overloaded as done in this program. They can be overloaded with normal functions or other templates.
Q 11. What will be the output of the following C++ code?
#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
template<class T>
T func(T a)
{
cout<<a;
return a;
}
int func(int a)
{
cout<<a;
}
int main(int argc, char const *argv[])
{
int a = 5;
int b = func(a);
float c = func(5.5);
return 0;
}
A. 5
B. 55.5
C. Error
D. Segmentation fault
Show Answer
Answer:-B. 55.5Explanation
C++ allows to overload template functions with normal functions therefore the program does not gives any error. When program is executed then int b = func(a); calls the normal function whereas float c = func(5.5) calls the template function.
Q 12. What will be the output of the following C++ code?
#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
template<class T>
T func(T a)
{
return a;
}
template<class T, class U>
T func(U a)
{
return (T)a;
}
int main(int argc, char const *argv[])
{
int a = 5;
int b = func(a);
int c = func(5.5);
cout<<b<<c<<endl;
return 0;
}
A. 5
B. 55
C. Error
D. Segmentation fault
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