1.2 simplest C + + programs

#include <iostream>using namespace Std;int main () {cout<< "This is a C + + program"; return 0;}

Let's take a look at the third line in the program, where main represents the name of the "main function". Each C + + program must have a main function. The INT function in front of main is to declare that the type of the function is integer (standard C + + requires that the main function must be declared as int.) Some operating systems
A numeric value must be returned to the operating system after the program is required to execute. Note: This is handled in C + +, if the program is performing normally, return the value 0 to the operating system, otherwise return the value-1), remember: Add int in front of main, and add a statement "return 0" after the main function;

1.2 simplest C + + programs