general computer science for engineers cisc 106 lecture 26 dr. john cavazos computer and information...

General Computer General Computer Science Science

for Engineersfor EngineersCISC 106CISC 106

Lecture 26Lecture 26

Dr. John CavazosComputer and Information Sciences

04/24/2009

Lecture OverviewLecture OverviewIntroducing C++C++ vs. MATLABMore about C++

A programming languageDerived from a language called CUbiquitous Object Oriented

◦Easier to write large scale projects◦Reusability

High Performance

Supports data securityHelps code reuseAllows multiple functions/operators with same name

Large projectsSystems applicationsGraphicsData StructuresWant to speed up your scripts 

When not to use C++When not to use C++Small programsPrototyping (MATLAB, scripting

languages)Web applications (javascript)

C++ versus MATLABC++ versus MATLABMATLAB uses an interpreter

To run can just type and use matlab commands

C++ uses a compilerProgram converted to machine code

with compiler

C++ versus MATLABC++ versus MATLABMATLAB uses dynamic typing

Introduce new variables as neededType of variable discovered by use

C++ uses static typingVariables have to be introducedType is given when introduced

C++ Data TypesC++ Data Types

Must introduce variables before using“Double quotes” for stringsInput and output

int studentAge;

cout << “How old are you?”;cin >> studentAge;

Arrows “show the way” data if flowing

cout << … going out (output)cin >> … going in (input)

cout << “Student Age” << 20 << endl;

int i;float f;cin >> i;cin >> f;

#include <iostream>using namespace std;

int main(){ // display output cout << “Hello World\n”;}

$ CC –o helloworld helloworld.cc$ ./helloworldHello World$