learn/doc/cpp_type_variable at main · gyuho/learn

learn/doc/cpp_type_variable at main · gyuho/learn

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C++: type, variable

type

C++ type system

variable

/*
g++ -std=c++11 00_variable.cpp -o 00_variable;
./00_variable;
*/
#include <iostream>
using namespace std;

int main()
{
	// declaring variables:
	int a, b;

	a = 7;
	b = 2;
	a = a + 1;
	b++;
	auto c = a - b;
	// int c = a - b;
	cout << c << endl;
	// 5

	string st1("Hello");
	cout << st1 << endl;
	// Hello

	string st2 = "World";
	cout << st2 << endl;
	// World

	return 0;
}

According to FAQ , return 0; is not needed:

In C++, main() need not contain an explicit return statement. In that case, the value returned is 0, meaning successful execution.

#include <iostream>

int main()
{
	std::cout << "This program returns the integer value 0\n";
}