CS 211:
Introduction to Computer Programming II

	Instructor: Brian M. Dennis
	Teaching Assistants:
	Tom Lechner, Bin Lin
	http://www.cs.northwestern.edu/~bmd/cs211/

A Simple C++ program

	#include <iostream>
	using namespace std;
	// HelloWorld programs originated with the
	// book “The C Programming Language”
	main() {
	cout << “Hello, World\n”;
	}

Scheme Equivalent

	;; HelloWorld programs originated with the
	;; book “The C Programming Language”
	(display “Hello World”)
	(newline)

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Slightly More Complex

	#include <iostream>
	using namespace std;
	main() {
	cout << “The answer to the universe\n”
	<< 42;
	}

A New Literal Datatype

	#include <iostream>
	using namespace std;
	main() {
	cout << “Pi is: “ << 3.14159f << “\n”;
	}

Some Arithmetic

	#include <iostream>
	using namespace std;
	main() {
	cout << “1 + 1 = “ << 1 + 1 << “\n”;
	cout << “2 * 2 = “ << 2 * 2 << “\n”;
	cout << “3 – 5 = “ << 3 – 5 << “\n”;
	cout << “11 / 2 = “ << 11 / 2 << “\n”;
	}

Conditional

	#include <iostream>
	using namespace std;
	main() {
	if ((10 % 2) == 0)
	cout << “10 is even\n”;
	if (5 % 2)
	cout << “5 is odd\n”;
	if ((5 % 2) != 0)
	cout << “5 is odd\n”;
	}

Variables

	#include <iostream>
	using namespace std;
	main() {
	int integer_temp =  1 + 1;
	cout << “1 + 1 = “ << integer_temp << “\n”;
	float floating_point_temp;
	floating_point_temp = 1.414f;
	cout << “Root 2 = “ << floating_point_temp
	<< “\n”;
	}

Scheme Equivalent

	(let ((integer_temp (+ 1 1))
	(floating_point_temp 1.414))
	(display “1 + 1 = “)
	(display integer_temp)
	(newline)
	(display “Root 2 = “)
	(display floating_point_temp)
	(newline)
	)

Slightly tweaked

	(let ((temp (+ 1 1)))
	(display “1 + 1 = “)
	(display temp)
	(newline)
	(set! temp 1.414)
	(display “Root 2 = “)
	(display temp)
	(newline)
	)

Variables

	#include <iostream>
	using namespace std;
	main() {
	int temp =  1 + 1;
	cout << “1 + 1 = “ << temp << “\n”;
	temp = 1.414;
	cout << “Root 2 = “ << temp << “\n”;
	}

That’s a Wrap

	Reading
	SICP
		CH 1
		D&D Ch1
			1.14, 1.19 – 1.25