Summary maths expressed in coding

Writing Mathematical Expressions and Operators in C++

Topics to be covered:

 Writing to the console and formatting output in C++

 Understanding operator precedence and using parentheses

 Best practices in C++: avoiding magic numbers with constants

 Working with numbers in C++: understanding narrowing conversions

1. Writing to the console and formatting output in C++



In C++, we can write to the console using the std::cout stream. To format the output, we can use
the << operator to insert formatting flags, such as std::endl for a new line and std::setw() for width.

Example code:

#include <iostream>



int main() {

std::cout << "Hello, world!" << std::endl;

std::cout << std::setw(10) << 5;

}

2. Understanding operator precedence and using parentheses



When writing mathematical expressions in C++, it is important to understand operator precedence.
For example, multiplication and division operations are performed before addition and subtraction
operations. Parentheses can be used to override this order.

Example code:

#include <iostream>



int main() {

std::cout << 2 + 2 * 3 << std::endl; // Outputs: 8

std::cout << (2 + 2) * 3 << std::endl; // Outputs: 12

}

3. Best practices in C++: avoiding magic numbers with constants