C + + Basic tutorials-common data types

First, common data types

The program can handle a variety of data, we provide data to the program, and then get the expected results, let's look at an exercise;

1, start Geany

1 point Menu "application-programming-geany" Start Geany, create a new C + + source program;

2 Point Menu "file-Save as" command, to "Shuju" as the filename, save the file to its own folder;

2, input program code

1 in the Blue Code area below, enter a line "cout << 18;" (read as C-out, the final semicolon do not leak);

#include <iostream>

using namespace Std;

int main (int argc, char** argv)

{

cout << 18;

return 0;

}

2 save, compile, build, run will display a number 18, this is the numerical data;

3 Closes the return to the program window, presses the ENTER key in front of the cout, inserts a row,

Enter a line "cout <<" 2*9= ";" The semicolon does not leak;

cout << "2*9=";

cout << 18;

4 save, compile, build, run, this time with a double quotation mark is called string data;

5 then click the ENTER key before the first cout, insert a blank line, and enter "cout << 9+9=" << 9+9 << Endl; " ；

cout << "9+9=" << 9+9;

cout << Endl;

6 The double quotes in front of this line are strings, followed by numeric addition operations,

The next line of Endl is a carriage return line feed, if not added to the next line together;

7 save, compile, build and run, now shows two lines;

8 Here is required to remember: The double quotes are strings, which can have letters, numbers, symbols, and 0~9 is composed of numbers;

#include <iostream>

using namespace Std;

int main (int argc, char** argv)

{

cout << "9+9=" << 9+9;

cout<<endl;

cout << "2*9=";

cout << 18;

return 0;

}