C++Primer：练习1.3 1.4 1.5 1.6

#include<iostream>

int main()
{
    
    
	//练习1.3：
	std::cout << "Hello, World" << std::endl;

	//练习1.4：
	int i = 5, j = 6;
	std::cout << i * j << std::endl;
	
	//练习1.5:
	std::cout << "Language is poor,"
		<< "show me your code!" << std::endl;

	//练习1.6:
	int v1 = 1;
	int v2 = 2;
	std::cout << "The sum of " << v1
		<< " and " << v2
		<< " is " << v1 + v2 << std::endl;

}