This world is full of questions and we will try to answer a few of them.
Q5. Write a program to display the following output using a single cout statement.
Program = 20
Documentation = 23
Logic = 21
Flow chart = 18
Ans.
#include<iostream.h>
#include<conio.h> //for clrscr()
void main()
{
clrscr(); //for clear screen
cout<<“\n Program = 20 \n Documentation = 23 \n Logic = 21 \n Flow chart = 18”;
}
Output:
Program = 20
Documentation = 23
Logic = 21
Flow chart = 18
Q4. Write a C++ program that inputs a student’s marks in three subjects (out of 100) and prints the percentage marks.
Ans.
#include<iostream.h>
#include<conio.h> //for clrscr()
int main()
{
clrscr(); //for clear screen
float sub1,sub2,sub3,marks,perc;
cout<<“Enter marks obtained in 3 subjects:”;
cin>>sub1>>sub2>>sub3;
marks=sub1+sub2+sub3;
perc=(marks/300)*100;
cout<<“\n”<<“The percentage marks are:”<<perc<<“%”;
return 0;
}
Output
Enter marks obtained in 3 subjects:69 89 78
The percentage marks are:78.666664%
Q3. Write a program to calculate the square of a number.
Ans.
#include<iostream.h>
#include<conio.h> //for clrscr()
int main()
{
clrscr(); //for clear screen
int var,sqrs;
cout<<“Enter variables:”;
cin>>var;
sqrs=var*var;
cout<<“\n”<<“The square is: “<<sqrs;
return 0;
}
Output
Enter variables:5
The square is: 25
Q2. Write a program to print sum of two values.
Ans.
#include<iostream.h>
#include<conio.h> //for clrscr()
int main()
{
clrscr(); //for clear screen
int value1, value2, sum;
cout<<“Enter First Value: “;
cin>>value1;
cout<<“Enter Second Value: “;
cin>>value2;
sum=value1 + value2;
cout<<“The sum of given values is: “;
cout<<sum;
return 0;
}
Output
Enter First Value: 6
Enter Second Value: 7
The sum of given values is: 13
Q1. Write a program to print a string on the screen.
Ans.
//My first C++ PROGRAM
#include<iostream.h>
int main()
{
cout<<“WELCOME TO C++ PROGRAMMING”;
return 0;
}
Output
WELCOME TO C++ PROGRAMMING
Q4. Explain the role of a compiler in a programming language. What type of errors it generally reports?
Ans. A part of the compiler’s job is to analyze the program code for “correctness”. If the meaning of a program is correct, then a compiler can not detect error (for example, if different statements are used etc.). but a compiler can certainly detect error in the form of a program. Some common forms of program errors are as given below:
Syntax error occur when rules of programming language are misused, that is, when a grammatical rule of C++ is violated.
Syntax refers to formal rules governing the construction of valid statements in a language. Read More …
Q3. Explain the role and importance of file iostream.h in C++.
Ans. The header file iostream.h is included in every C++ program to implement input/output facilities. Input/Output facilities are not defined with C++ language, but rather are implemented through a component of C++ standard library, iostream.h which, is I/O library.
In C++, all devices are treated as files. Thus, the standard input device (the keyboard) (where from the input is received), the standard output device (the screen/monitor) (where the output is displayed) and the standard error device (the screen/monitor) (where the errors, if any, are displayed) are all treated as files. At its lowest level, a file is interpreted simply as a sequence, or stream of bytes. At this level, the notion of a data type is absent, that is, data is treated simply as sequence of bytes without considering its data type. However, at the user level, a file consists of a sequence of possibly intermixed data types-characters, arithmetic values, class objects etc.
The Function of I/O Library – iostream.h Read More …
Q2. Explain different types of literals in C++ by giving appropriate examples.
Ans. Literals (often referred to as constants) are data items that never change their value during a program run.
C++ allows three types of literals:
For example:
1234, ‘t’, 2.0, “rty”, etc.
Integer Constant
Integer constants are whole numbers without any fractional part.
The method of writing integer constants has been specified in the following rule:
An integer constant must have at least one digit and must not contain any decimal point. It may contain either + or – sign. A number with no sign is assumed to be positive. Commas cannot appear in an integer constant.
For example, 1234, 41, +97, -17.
Character Constant
A character constant is one character enclosed in single quote, as in ‘z’.
The rule for writing character constant is given below:
A character constant in C++ must contain one character and must be enclosed in single quotation marks. Read More …
Q1. Explain tokens in C++. Also discuss their role and importance.
Ans. The smallest individual unit in a program is known as a token.
C++ has the following tokens:
Keywords are the words that convey a special meaning to the language compiler. These are reserved for special purpose and must not be used as normal identifier names.
For example:
break, delete, if, goto, int, char, etc.
Identifiers are fundamental building blocks of a program and are used as the general terminology for the names given to different parts of the program through variables, objects, classes, functions, arrays etc.
For example:
Myfile, MYFILE, _CHGK, DATE_7_73,etc.
Identifier forming rule of C++ states the following:
An identifier is an arbitrarily long sequence of letters and digits. The first character must be a letter; the underscore (_) counts as a letter. Upper and lower-case letters are different. All characters are significant.
Literals (often referred to as constants) are data items that never change their value during a program run.
C++ allows three types of literals:
For example:
1234, ‘t’, 2.0, “rty”, etc. Read More …
Q27. Write a C++ program to accept two integers and print their sum.
Ans.
#include<iostream.h>
#include<conio.h> //for clrscr()
void main()
{
int value1,value2,sum;
clrscr(); //for clear screen
cout<<“\n Enter the first value: “;
cin>>value1;
cout<<“\n Enter the second value: “;
cin>>value2;
sum=value1+value2;
cout<<“\n The sum of these values is “<<sum;
}
Output
Enter the first value: 34
Enter the second value: 45
The sum of these values is 79