C++ Programming Questions and Answers – Complex Library – 1

This set of C++ Programming Multiple Choice Questions & Answers (MCQs) focuses on “Complex Library – 1”.

1. Which header file is required to use complex class in your program?
a) <complex>
b) <math>
c) <complex_math>
d) <algorithm>
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2. Which of the following is the correct syntax of declaring a complex number?
a) complex variable_name<type>;
b) complex<type> variable_name;
c) Complex<type> variable_name;
d) Complex variable_name<type>;
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3. Which function is used to get the real part of the complex number?
a) img_p()
b) imag_p()
c) real()
d) real_p()
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4. Which function is used to get the imaginary part of the complex number?
a) real()
b) imag()
c) imag_p()
d) real_p()
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5. What will be the output of the following C++ code?

#include <iostream>
#include <complex>
using namespace std;
int main()
{
	complex <double> cn(3.0, 5.0);
	cout<<"Complex number is: "<<real(cn)<<" + "<<imag(cn)<<"i"<<endl;
	return 0;
}

a) Complex number is: 3 + 5i
b) Complex number is: 5 + 3i
c) Complex number is: 9 + 25i
d) Complex number is: 3 – 5i
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6. Which function is used to get the absolute of a complex number?
a) ret()
b) norm()
c) mod()
d) abs()
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7. What will be the output of the following C++ code?

#include <iostream>
#include <complex>
using namespace std;
int main()
{
	complex <double> cn(3.0, 5.0);
	cout<<"Absolute value is: "<<abs(cn)<<endl;
	return 0;
}

a) Absolute value is: 4
b) Absolute value is: 5
c) Absolute value is: 3
d) Absolute value is: 5.83095
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8. Which function is used to get the argument of a complex number?
a) abs()
b) norm()
c) arg()
d) argu()
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9. What will be the output of the following C++ code?

#include <iostream>
#include <complex>
using namespace std;
int main()
{
	complex <double> cn(3.0, 5.0);
	cout<<arg(cn)<<endl;
	return 0;
}

a) 1.03038
b) 0
c) Not defined
d) Error
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10. What is the use of polar function?
a) Used to construct a complex number from the real and imaginary part
b) Used to construct a complex number from magnitude and phase angle
c) Used to construct a complex number from the magnitude and real part
d) Used to construct a complex number from argument and phase angle
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Sanfoundry Global Education & Learning Series – C++ Programming Language.

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