First look at the C++ programming language and familiarity with the simple cout and cin commands and variables.

Use the "iostream" library to access the cout and cin commands.

In the third line of the program from the command using namespace std;. It is used for ease of work in the coding section, because if this line is deleted, for each command (cout, cin, string, vector & ...) in the next lines, you must first write std:: which will be annoying in long programs. The other part of the first look is related to getting acquainted with the types of variables and taking input from the user with the cin command and placing it in the desired variable.

int, unsigned int, signed int, short int, unsigned short int, signed short int, long int, signed long int, unsigned long int

For integers according to the required range

float, double, long double

For reference numbers according to the required range

char, unsigned char, signed char

For characters (unicodes, letters of the alphabet, etc.)

wchar_t

For storing large characters with high range

string

To store strings