Computer Programming 2 Module 2 & 3

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Question

Answer

Check if a character is a digit

isdigit()

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Returns true provided character expression is a lowercase letter otherwise it returns false

islower()

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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

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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

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A function which checks if a character is printable

isprint()

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#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

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#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

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#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

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Which of the following converts string to float?

stof

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Which of the following function converts a numerical value to string?

to_string

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#include <iostream> #include <string> using namespace std; int main () { string str1 = "Hello "; string str2 = "World"; cout << ""; return 0; }

Blank output

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A function that converts a string to double?

stod

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What is the output of the following program? #include <iostream> #include <string> using namespace std; int main () { string str3(5, '#'); cout << str3; return 0; }

#####

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What is the header file for the string class?

#include <string>

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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

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It returns true if str is an empty string

str.empty();

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Check if a character is blank

isblank()

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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

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Which of the following is a ctype function?

isalpha ()

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Compares up to num characters of the C string str1 to those of the C string str2

strcmp()

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It returns the uppercase version of a character expression.

toupper()

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A function used to concatenate strings

strcat()

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Which of the following is a cstring function?

strcmp()

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#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

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#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

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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

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What is the output of the given program? #include <iostream> #include <string> using namespace std; int main () { string str1 = ""; cout << str1.empty(); return 0; }

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#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; }

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What is the identifier given to string class to declare string objects?

string

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#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

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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

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A function directly writes into the file:

fprintf()

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Creates a new file or open an existing file

fopen()

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Which of the following is used to create an output stream?

iostream

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Which operator is used to insert the data into the file?

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Which header file is used for reading and writing to a file?

#include<fstream>

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Which stream class is to only read from files?

ifstream

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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

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What is the output of the given program? #include<iostream> using namespace std; main() { class student { int rno = 10; } v; cout<<v.rno; }

Error

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Pick out the other definition of objects.

associate of the class

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Which of the following best defines a class?

Blueprint of an object

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It means displaying only essential information and hiding the details.

Abstraction

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Blueprint of an object

Class

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What is the output of this program? class Test { int x; }; int main() { Test t; cout << t.x; return 0; }

Error

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If a class is named Car and you will create an object named SportsCar, what would be the statement?

Car SportsCar;

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If a class is named Fruits and you will create an object named Apple, what would be the statement?

Fruits Apple;

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Which of the following operator is used for cout?

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File mode that opens a text file in append mode

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Closes a file

fclose()

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What is the correct syntax for fclose()

fclose(fp);

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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

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Which stream class is used to both read and write on files?

fstream

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The ifstream would be used when:

reading a file

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A C++ library that allows working with files

fstream

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What is meant by ofstream in c++?

Writes to a file

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A behavior an object

class

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What is the additional feature in classes that were not in structures?

Member Functions

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Objects created are based on what?

class

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An object is a _________________ of a class

an instance

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Which of the following term is used for a function defined inside a class?

Member function

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What is the difference between a struct and a class in C++?

A class has a default privacy specification of private

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