C++ Basic Concepts
C++ is a
General purpose programming language
<iostream>
header defines the standard stream objects that input and output data
what is a set of logically connected statements
A block is a set of logically connected statements, surrounded by opening and closing curly braces.
how to write multiple statements on a single line
You can have multiple statements on a single line, as long as you remember to end each statement with a semicolon. Failing to do so will result in an error.
# the number sign
at the beginning of a line targets the compiler's pre-processor. In this case #include tells the pre-processor to include the <iostream> header
comments
comments are statements that explain what the code is doing. A comment beginning with two slashes (//) is called a single-line comment
Multi-Line comments
comments that require multiple lines begins with /* and end with */
what is the insertion operator
cout is used in combination with the insertion operator. Write the insertion operator as << to insert the data that comes after it into the stream that comes before.
what indicates the beginning and end of a function
curly brackets{} indicate the beginning and end of a function, which can also be called the function's body. The information inside the brackets indicates what the function does when executed.
A c++ program is a collection
of commands or statements
what is a way to print two lines
one way to print two lines is to use the endl manipulator, which will put in a line break
what does program execution begin with
program execution begins with the main function, int main()
what is used to perform input and output operations
streams are used to perform input and output operations
using namespace std;
tells the compiler to use the std(standard) namespace. The std namespace includes features of the c++ standard library
what does c++ compiler ignore
the c++ compiler ignores blank lines. In general. blank lines to serve to improve the code's readability and structure. Whitespace, such as spaces, tabs, and newlines, is also ignored, although it is used to enhance the program's visual attractiveness.
what is the entry point of every c++ program
the entry point of every c++ program is main(), irrespective of what the program does
what is used to terminate a statement
In C++, the semicolon is used to terminate a statement. Each statement must end with a semicolon. It indicates the end of one logical expression.
what is an alternative to endl
the new line character \n can be used as an alternative to endl. The backlash (\) is called an escape character, and indicates a "special" character
what results in the display of "hello world" to the screen
the next line, cout << "Hello World" results in the display of "Hello World!" to the screen
cin
to enable the user to input a value, use cin in combination with the extraction operator (>>). The variable containing the extracted data follows the operator.
new lines
two newlines characters placed together result in a blank line
return
The last instruction in the program is the return statement. The line return 0; terminates the main() function and causes it to return the value 0 to the calling process. A non-zero value (usually of 1) signals abnormal termination.
