C++ Programming Questions and Answers – Character Classification

This set of C++ Programming Multiple Choice Questions & Answers (MCQs) focuses on “Character Classification”.

1. Which function is used to check whether a character is an alphabet?
a) isalpha()
b) isalnum()
c) isdigit()
d) isblank()
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2. Which function is used to check whether a character is an alphabet or number?
a) isalpha()
b) isalnum()
c) isdigit()
d) isblank()
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3. Which function is used to check whether a character is a number?
a) isalpha()
b) isalnum()
c) isdigit()
d) isblank()
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4. Which function is used to check whether a character is a tab or space?
a) isalpha()
b) isalnum()
c) isdigit()
d) isblank()
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5. Which function is used to check whether a character is tab or space or whitespace control code(\n,\r,etc.)?
a) isspace()
b) isalnum()
c) iscntrl()
d) isblank()
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6. Which function is used to check whether a character is tab or a control code?
a) isspace()
b) isalnum()
c) iscntrl()
d) isblank()
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7. Which function is used to check whether a character is printable on console?
a) isxdigit()
b) isprint()
c) iscntrl()
d) ispunct()
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8. Which function is used to check whether a character is hexadecimal?
a) isxdigit()
b) isprint()
c) iscntrl()
d) ispunct()
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9. Which function is used to check whether a character is punctuation mark?
a) isxdigit()
b) isprint()
c) iscntrl()
d) ispunct()
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10. What will be the output of the following C++ code?

#include <iostream>
#include <cctype>
using namespace std;
int main(int argc, char const *argv[])
{
	char arr[12] = "Hello World";
	for(int i=0;i<12;i++)
        {
		cout<<(bool)isalpha(arr[i]);
	}
}

a) 111110111110
b) 111111111110
c) 111000111110
d) 111110000000
View Answer

11. What will be the output of the following C++ code?

#include <iostream>
#include <cctype>
using namespace std;
int main(int argc, char const *argv[])
{
	char arr[12] = "H3ll0 W0r1d";
	for(int i=0;i<12;i++)
        {
		cout<<(bool)isalpha(arr[i]);
	}
	cout<<endl;
	for(int i=0;i<12;i++)
        {
		cout<<(bool)isdigit(arr[i]);
	}
}

a)

000000000000
010010010100

b)

101100100010
010010010111

c)

111111101010
010010000000

d)

101100101010
010010010100

12. What will be the output of the following C++ code?

#include <iostream>
#include <cctype>
using namespace std;
int main(int argc, char const *argv[])
{
	char arr[12] = "H3ll0\tW0r1d";
	for(int i=0;i<12;i++)
        {
		cout<<(bool)isprint(arr[i]);
	}
}

a) 111000111110
b) 111111111110
c) 111110111110
d) 111110000000
View Answer

13. What will be the output of the following C++ code?

#include <iostream>
#include <cctype>
using namespace std;
int main(int argc, char const *argv[])
{
	char arr[12] = "H3ll0\tW0r1d";
	for(int i=0;i<12;i++)
        {
		cout<<(bool)iscntrl(arr[i]);
	}
}

a) 111111111110
b) 000001000001
c) 111000111110
d) 111110000000
View Answer

14. What will be the output of the following C++ code?

#include <iostream>
#include <cctype>
using namespace std;
int main(int argc, char const *argv[])
{
	char arr[20] = "\'H3ll0\'";
	for(int i=0;i<8;i++)
        {
		cout<<(bool)ispunct(arr[i]);
	}
}

a) 10000010
b) 111111111110
c) 111000111110
d) 111110000000
View Answer

15. What will be the output of the following C++ code?

#include <iostream>
#include <cctype>
using namespace std;
int main(int argc, char const *argv[])
{
	char arr[27] = "abcdefghijklmnopqrstuvwxyz";
	for(int i=0;i<27;i++)
        {
		cout<<(bool)isxdigit(arr[i]);
	}
}

a) 111001100011110000000111100
b) 101010101010101001010101010
c) 111111000000000000000000000
d) 111111111000001111011110111
View Answer

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