| Question | Answer |
| Check if a character is a digit | isdigit() |
| Returns true provided character expression is a lowercase letter otherwise it returns false | islower() |
| What is the output of the given program?
#include <iostream>
#include <ctype.h>
using namespace std;
int main ()
{
int i=0;
char str[]="Test String.\n";
char c;
while (str[i])
{
c=str[i];
if (islower(c)) c=toupper(c); | TEST STRING |
| Check the following program
#include <iostream>
#include <ctype.h>
using namespace std;
int main ()
{
int i;
char str[]="c3po...??";
i=0;
while (isalnum(str[i])) i++;
cout << "The first " << i << " characters are al | 4 |
| A function which checks if a character is printable | isprint() |
| #include <cctype>
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char str[] = "THIS IS A TEST";
for (int i=0; i<strlen(str); i++)
putchar(tolower(str[i]));
return 0;
} | this is a test |
| #include <iostream>
#include <string>
using namespace std;
int main () {
string str1 = "Hello ";
string str2 = "World";
string str3;
str3 = str1.append(str2);
cout << str3 << endl;
return 0;
} | Hello World |
| #include <iostream>
#include <string>
using namespace std;
int main ()
{
string str1 = "This is a test";
string str2 = "test";
cout << "Word is found at index " << str1.find(str2,0);
return 0;
} | Word is found at index 10 |
| Which of the following converts string to float? | stof |
| Which of the following function converts a numerical value to string? | to_string |
| #include <iostream>
#include <string>
using namespace std;
int main ()
{
string str1 = "Hello ";
string str2 = "World";
cout << "";
return 0;
} | Blank output |
| A function that converts a string to double? | stod |
| What is the output of the following program?
#include <iostream>
#include <string>
using namespace std;
int main () {
string str3(5, '#');
cout << str3;
return 0;
} | ##### |
| What is the header file for the string class? | #include <string> |
| What is the output of the following program?
#include <string>
#include <iostream>
using namespace std;
int main()
{
string x = "Bad ";
cout << x.append(Romance);
return 0;
} | Error |
| It returns true if str is an empty string | str.empty(); |
| Check if a character is blank | isblank() |
| What is the output of the given program?
#include <iostream>
#include <ctype.h>
int main ()
{
int i=0;
char str[]="first line ";
return 0;
} | blank screen |
| Which of the following is a ctype function? | isalpha () |
| Compares up to num characters of the C string str1 to those of the C string str2 | strcmp() |
| It returns the uppercase version of a character expression. | toupper() |
| A function used to concatenate strings | strcat() |
| Which of the following is a cstring function? | strcmp() |
| #include <cctype>
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char str[] = "hj;pq91js4";
cout << "The digit in the string are:" << endl;
for (int i=0; i<strlen(str); i++)
{
if (isdig | 9 1 4 |
| #include <cctype>
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char str[] = "c++ programming";
for (int i=0; i<strlen(str); i++)
putchar(toupper(str[i]));
return 0;
} | C++ PROGRAMMING |
| What is the output of the following program?
#include <string>
#include <iostream>
using namespace std;
int main()
{
string x = "Bad ";
cout << x.append("Liar");
return 0;
} | Bad Liar |
| What is the output of the given program?
#include <iostream>
#include <string>
using namespace std;
int main ()
{
string str1 = "";
cout << str1.empty();
return 0;
} | 1 |
| #include <cstring>
#include <iostream>
using namespace std;
int main()
{
char str1[] = "C++";
string str = "Programming";
int len1 = strlen(str1);
int len2 = str.length();
cout << len1+len2;
return 0;
} | 14 |
| What is the identifier given to string class to declare string objects? | string |
| #include <iostream>
#include <string>
#include <cmath>
using namespace std;
int main ()
{
string s = "54.55";
double php = stod(s);
cout << "A dollar is equivalent to " << php
return 0;
} | Error |
| What is the output of the following program?
#include <iostream>
#include <string>
using namespace std;
int main () {
string str1 = "Trust";
int len = str1.size()
cout << len << endl;
return 0;
} | error |
| A function directly writes into the file: | fprintf() |
| Creates a new file or open an existing file | fopen() |
| Which of the following is used to create an output stream? | iostream |
| Which operator is used to insert the data into the file? | >> |
| Which header file is used for reading and writing to a file? | #include<fstream> |
| Which stream class is to only read from files? | ifstream |
| What is the output of the given program?
#include < iostream >
using namespace std;
int main ()
{
char str[] = "Steve jobs";
int val = 65;
char ch = 'A';
cout << val << endl;
return 0;
} | Error |
| What is the output of the given program?
#include<iostream>
using namespace std;
main() {
class student {
int rno = 10;
} v;
cout<<v.rno;
} | Error |
| Pick out the other definition of objects. | associate of the class |
| Which of the following best defines a class? | Blueprint of an object |
| It means displaying only essential information and hiding the details. | Abstraction |
| Blueprint of an object | Class |
| What is the output of this program?
class Test {
int x;
};
int main()
{
Test t;
cout << t.x;
return 0;
} | Error |
| If a class is named Car and you will create an object named SportsCar, what would be the statement? | Car SportsCar; |
| If a class is named Fruits and you will create an object named Apple, what would be the statement? | Fruits Apple; |
| Which of the following operator is used for cout? | << |
| File mode that opens a text file in append mode | rb |
| Closes a file | fclose() |
| What is the correct syntax for fclose() | fclose(fp); |
| What does the following code do?
while( (ch = getchar()) != '\n') {
putc(ch, fp);
} | Gets a character, put it into a file pointer until an enter is pressed |
| Which stream class is used to both read and write on files? | fstream |
| The ifstream would be used when: | reading a file |
| A C++ library that allows working with files | fstream |
| What is meant by ofstream in c++? | Writes to a file |
| A behavior an object | class |
| What is the additional feature in classes that were not in structures? | Member Functions |
| Objects created are based on what? | class |
| An object is a _________________ of a class | an instance |
| Which of the following term is used for a function defined inside a class? | Member function |
| What is the difference between a struct and a class in C++? | A class has a default privacy specification of private |
