Let’s think of a “real life example” where we need to find out if a person is old enough to vote.
In the example below, we use the >= comparison operator to find out if the age (25) is greater than OR equal to the voting age limit, which is set to 18: Continue reading C++ Boolean Examples
A Boolean expression returns a boolean value, which is either 1 (true) or 0 (false).
This is useful for building logic and finding answers.
You can use a comparison operator, such as the greater than (>) operator, to find out if an expression (or variable) is true or false : Continue reading C++ Boolean Expressions
Very often, in programming, you will need a data type that can only have one of two values, like:
For this, C++ has a bool data type, which can take the values true (1) or false (0). Continue reading C++ Booleans
C++ has many functions that allows you to perform mathematical tasks on numbers.
C-style strings are created with the char type instead of string.
The name comes from the C language, which, unlike many other programming languages, does not have a string type for easily creating string variables. Instead, you must use the char type and create an array of characters to make a “string” in C. Continue reading C++ C-Style Strings
You might see some C++ programs that run without the standard namespace library. The using namespace std line can be omitted and replaced with the std keyword, followed by the :: operator for string (and cout) objects:
#include <iostream>
#include <string>
// using namespace std; - Remove this line
int main() {
std::string greeting = "Hello";
std::cout << greeting;
return 0;
}
It is possible to use the extraction operator >> on cin to store a string entered by a user:
string firstName; cout << "Type your first name: "; cin >> firstName; // get user input from the keyboard cout << "Your name is: " << firstName; // Type your first name: John // Your name is: John
However, cin considers a space (whitespace, tabs, etc) as a terminating character, which means that it can only store a single word (even if you type many words): Continue reading C++ User Input Strings
Because strings must be written within quotes, C++ will misunderstand this string, and generate an error:
string txt = “We are the so-called “Vikings” from the north.”;
The solution to avoid this problem, is to use the backslash escape character. Continue reading C++ Special Characters
You can access the characters in a string by referring to its index number inside square brackets [].
This example prints the first character in myString : Continue reading C++ Access Strings
To get the length of a string, use the length() function : Continue reading C++ String Length