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C++ I/O and Arithmetic Operations, Exams of C programming

Eastern Arizona College C programming

The concept of streams in c++ for performing input and output operations. It covers cin and cout, i/o manipulators, and arithmetic operators. Code examples and explanations of how to use these features in c++.

Typology: Exams

2021/2022

Uploaded on 09/12/2022

ekaraj 🇺🇸

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1. Cin and Cout: Streams

● C++ uses streams



to perform input and output operations.

● A stream is an entity where a program can either insert or extract characters to/from.

● Streams are a source/destination of characters

● These characters are provided/accepted sequentially

stream

description

cin

standard input stream

cout

standard output stream

 Standard output (cout)

● Cout is used together with the insertion operator



, <<.

#include <iostream>

using namespace std;

int main()

{

cout << "Hello World! ";

}

● The << operator inserts the data that follows it into the stream that precedes it.

Multiple insertion operations (<<) may be chained in a single statement:

Standard input (cin)

● Cin is used together with the extraction operator, which is written as >>

● The extraction operation on cin uses the type of the variable to determine how it

interprets the characters read from the input.

#include <iostream>

using namespace std;

int main()

{

float x,y;

cout << "Please enter a value for x: ";

cin >> x;

cout << "Please enter a value for y: ";

cin >> y;

cout << "Values of x and y are:\n";

cout << "\tx = " << x << " \ty = " << y << '\n';

Partial preview of the text

Download C++ I/O and Arithmetic Operations and more Exams C programming in PDF only on Docsity!

1. Cin and Cout: Streams

● C++ uses streams to perform input and output operations.

● A stream is an entity where a program can either insert or extract characters to/from.

● Streams are a source/destination of characters

● These characters are provided/accepted sequentially

stream description

cin standard input stream

cout standard output stream

Standard output (cout)

● Cout is used together with the insertion operator , <<.

#include using namespace std;

int main() {

cout << "Hello World! " ;

}

● The << operator inserts the data that follows it into the stream that precedes it.

Multiple insertion operations (<<) may be chained in a single statement:

Standard input (cin)

● Cin is used together with the extraction operator, which is written as >>

● The extraction operation on cin uses the type of the variable to determine how it

interprets the characters read from the input.

#include using namespace std;

int main() { float x,y;

cout << "Please enter a value for x: " ; cin >> x; cout << "Please enter a value for y: " ; cin >> y; cout << "Values of x and y are:\n" ; cout << "\tx = " << x << " \ty = " << y << '\n' ;

2. I/O Manipulators

● Setprecision:

○ Sets the decimal precision to be used to format floating-point values on output

operations.

● Fixed:

○ Floating-point values are written using fixed-point notation

○ The value is represented with exactly as many digits in the decimal part as

specified by the precision field

● Showpoint:

○ The decimal point is always written for floating point values inserted into the

stream

○ Even for those whose decimal part is zero

● Scientific:

○ Floating-point values are written using scientific notation

○ The value is represented always with only one digit before the decimal point,

○ Decimal point is followed by as many decimal digits as the precision field

#include // std::cout, std::fixed #include // std::setprecision

int main () { double f =3.14159; double d = 2; std::cout << std::setprecision(5) << f << '\n'; std::cout << std::setprecision(9) << f << '\n'; std::cout << std::setprecision(9) << d << '\n'; //std::cout << std::showpoint; std::cout << std::showpoint << std::setprecision(5) << f << '\n'; std::cout << std::showpoint << std::setprecision(9) << f << '\n'; std::cout << std::showpoint << std::setprecision(9) << d << '\n'; //std::cout << std::fixed; std::cout << std::fixed << std::setprecision(5) << f << '\n'; std::cout << std::fixed << std::setprecision(9) << f << '\n'; std::cout << std::fixed << std::setprecision(9) << d << '\n'; std::cout << std::scientific << f << '\n'; std::cout << std::scientific << f << '\n'; std::cout << std::scientific << d << '\n'; return 0; }

Output:

2

product*=y; quotient = x; quotient/=y; rem = x; rem%=y; cout << "The sum is " << sum << endl; cout << "The diff is " << diff << endl; cout << "The product is " << product << endl; cout << "The quotient is " << quotient << endl; cout << "The rem is " << rem << endl; }

C++ I/O and Arithmetic Operations, Exams of C programming

Related documents

Partial preview of the text

Download C++ I/O and Arithmetic Operations and more Exams C programming in PDF only on Docsity!

1. Cin and Cout: Streams

● C++ uses streams to perform input and output operations.

● A stream is an entity where a program can either insert or extract characters to/from.

● Streams are a source/destination of characters

● These characters are provided/accepted sequentially

stream description

cin standard input stream

cout standard output stream

Standard output (cout)

● Cout is used together with the insertion operator , <<.

● The << operator inserts the data that follows it into the stream that precedes it.

Multiple insertion operations (<<) may be chained in a single statement:

Standard input (cin)

● Cin is used together with the extraction operator, which is written as >>

● The extraction operation on cin uses the type of the variable to determine how it

interprets the characters read from the input.

2. I/O Manipulators

● Setprecision:

○ Sets the decimal precision to be used to format floating-point values on output

operations.

● Fixed:

○ Floating-point values are written using fixed-point notation

○ The value is represented with exactly as many digits in the decimal part as

specified by the precision field

● Showpoint:

○ The decimal point is always written for floating point values inserted into the

stream

○ Even for those whose decimal part is zero

● Scientific:

○ Floating-point values are written using scientific notation

○ The value is represented always with only one digit before the decimal point,

○ Decimal point is followed by as many decimal digits as the precision field

5. Recitation Quiz Question:

Read in 2 integers. Print the difference between the two.

6. Recitation Quiz Question:

Read in 2 integers. Print the quotient when the first number is divided by the

second.