lecture #5

Reed book, read chapter 1.

First quiz, in lab, next wednesday. covers material up to the end of today.

HW#1:
1) Convert these numbers to binary:
7
14
103

2) Convert these binary numbers to decimal:
11001
110
11
1101

3) Convert those numbers in part 2 to octal.
4) Convert those numbers in part 2 to hexadecimal.

end user software. e.g Microsoft Word

programming software. Integrated development environment for creating end-user software. compiler. things used by programmers to create software.

system software. your operating system. Windows XP. lets you launch programs, manage files. used by other programs.

How do you program a computer?
Computer speaks machine language. 01110101 1111
Do humans speak machine language?

assembly language
mov ax, 4
mov bx, 5
add ax, bx

mov = 1001
add = 1111
ax = 1000
bx = 0001

1001 1000 0100
1001 0001 0101
1111 1000 0001

this process of translating TO / FROM machine language very simple.

http://en.wikipedia.org/wiki/Assembly_language
low-level programming languag

assembler

http://en.wikipedia.org/wiki/Low-level_programming_language

first generation, second generation languages

High-level programming language
http://en.wikipedia.org/wiki/High-level_programming_language

Some C++ code to calculate costs:
http://www.functionx.com/cpp/examples/ifelse1.htm
#include <iostream>
using namespace std;

void main()
{
    unsigned int Miles;
    const double LessThan100 = 0.25;
    const double MoreThan100 = 0.15;
    double PriceLessThan100, PriceMoreThan100, TotalPrice;

    cout << "Enter the number of miles: ";
    cin >> Miles;

    if(Miles <= 100)
    {
        PriceLessThan100 = Miles * LessThan100;
        PriceMoreThan100 = 0;
    }
    else
    {
        PriceLessThan100 = 100 * LessThan100;
        PriceMoreThan100 = (Miles - 100) * MoreThan100;
    }

    TotalPrice = PriceLessThan100 + PriceMoreThan100;

    cout << "\nTotal Price = $" << TotalPrice << "\n\n";
}

compiler or an interpreter
compiler does the translation up front.
takes in C++ sources code. outputs machine language.

interpreter.
does not translate front.
translates as executing, as carrying out the instructions.

C++ compiled.
Javascript interpreted.

First quiz only up to this point.
Quiz does not include book material.