常变量const

#include<iostream>

void main()
{
	const int a = 3;//常变量的值不能改变，始终为3
	/*
	不能错误写成   const int a;
	               a=3;
	*/
	int b = 4;
	int c;
	c = a + b;
	std::cout << "c= " << c << std::endl;
	std::cin.get();
}