ProblemProblem

You require an algorithm that will receive You require an algorithm that will receive the length of the hypotenuse and one of the length of the hypotenuse and one of the sides of a right triangle, and calculate the sides of a right triangle, and calculate the length of the remaining side and the the length of the remaining side and the two acute angles in the triangle. two acute angles in the triangle.

ProblemProblem

You require an algorithm that will You require an algorithm that will receivereceive the the length of the hypotenuselength of the hypotenuse and and one of one of the sidesthe sides of a right triangle, and of a right triangle, and calculatecalculate the the length of the remaining sidelength of the remaining side and the and the two acute anglestwo acute angles in the triangle. in the triangle.

ProblemProblem

side1

side2

hyp

angle1

angle2

Defining DiagramDefining Diagram

InputsInputs ProcessingProcessing OutputOutput

hyphyp

side1side1

PromptPrompt for and for and getget hyp hyp and side1and side1

CalculateCalculate side2 side2 (Pythagorean theorem)(Pythagorean theorem)

CalculateCalculate angle1 and angle1 and angle2angle2

DisplayDisplay results results

side2side2

angle1angle1

angle2angle2

Calculate_Side_and_AnglesCalculate_Side_and_Angles

Prompt user for hyp and side1Prompt user for hyp and side1

Get hyp and side1Get hyp and side1

side2 = hyp*hyp – side1*side1side2 = hyp*hyp – side1*side1

side2 = SQRT(side2)side2 = SQRT(side2)

angle1 = ARCSIN (side2/hyp)angle1 = ARCSIN (side2/hyp)

angle2 = 90 – angle1angle2 = 90 – angle1

Display side2, angle1 and angle2Display side2, angle1 and angle2

ENDEND

Basic Elements of C++Basic Elements of C++

# include <iostream># include <iostream>

using namespace std;using namespace std;

int main()int main()

{ {

cout<<“Hello world!”;cout<<“Hello world!”;

return 0;return 0;

}}

Preprocessor directive

Function main

Semicolons

Curly braces

# include <iostream># include <iostream>

using namespace std;using namespace std;

int main()int main()

{ {

cout<<“Hello world!”;cout<<“Hello world!”;

return 0;return 0;

}}

# include <iostream># include <iostream>

using namespace std;using namespace std;

void main()void main()

{ {

cout<<“Hello world!”;cout<<“Hello world!”;

return;return;

}}

# include <iostream># include <iostream>using namespace std;using namespace std;

int main() int main() { { cout<<“Hello world!”;cout<<“Hello world!”; return 0;return 0;}}

/* This is our first C++ /* This is our first C++ programprogram Oh, how exciting!!!!!Oh, how exciting!!!!!*/*/

//this is our first function//this is our first function

//this is preprocessor //this is preprocessor directivedirective

VariablesVariables

Identifiers can consist ofIdentifiers can consist ofLettersLettersDigits (but cannot start with digits)Digits (but cannot start with digits)Underscore characterUnderscore character

Identifiers are case sensitive.Identifiers are case sensitive.

Identifiers should be self-explanatory.Identifiers should be self-explanatory.

price+taxprice+tax My NumberMy Number costofthepurchasecostofthepurchase _total_sum_total_sum one*twoone*two pay$pay$ xcsrtysbxcsrtysb Average_AgeAverage_Age 3rd_side3rd_side

Valid Identifiers?

C++ Data TypesC++ Data Types

SimpleSimple StructuredStructuredPointersPointers

Basic Data TypesBasic Data Types

Integer - Integer - int int Floating point value – Floating point value – float, doublefloat, doubleCharacter - Character - charcharBoolean - bool - bool

1.1. 3.33.32.2. -4-43.3. 39.00139.0014.4. 005.5. 0.00.06.6. ‘‘d’d’7.7. ‘‘Bob’Bob’8.8. 9.09.09.9. +123+12310.10. ‘ ’‘ ’

Variable DeclarationVariable Declaration

data-type variable-name data-type variable-name , var-name…, var-name…

int num;int num;

float price1, price2;float price1, price2;

double average; double average;

char letter_grade;char letter_grade;

optional

Variable InitializationVariable Initialization

int a=3; int a=3; //initialization//initialization

int a;int a;

a=3;a=3; //assignment//assignment

int a;int a;

cin>>a; cin>>a; //input data//input data

# include <iostream># include <iostream>using namespace std;using namespace std;

int main() int main() { { int age;int age; cout<<“Enter your age”;cout<<“Enter your age”; cin >>age;cin >>age; cout<<endl<<“You are ”<<age;cout<<endl<<“You are ”<<age; return 0;return 0;}}

Calculate_MidpointCalculate_Midpoint

Prompt user for x1, y1, x2, y2Prompt user for x1, y1, x2, y2

Get x1, y1, x2, y2Get x1, y1, x2, y2

xm=(x1+x2)/2xm=(x1+x2)/2

ym=(y1+y2)/2ym=(y1+y2)/2

Display xm and ymDisplay xm and ym

ENDEND

# include <iostream># include <iostream>using namespace std;using namespace std;int main()int main(){{

int x1, y1, x2, y2, xm, ym;int x1, y1, x2, y2, xm, ym;cout<<endl<<“Enter the coordinates of the 1st point”;cout<<endl<<“Enter the coordinates of the 1st point”;cin >>x1 >>y1;cin >>x1 >>y1;cout<<endl<<“Enter the coordinates of the 2nd point”;cout<<endl<<“Enter the coordinates of the 2nd point”;cin>>x2 >>y2;cin>>x2 >>y2;xm=(x1+x2)/2;xm=(x1+x2)/2;ym=(y1+y2)/2;ym=(y1+y2)/2;cout<<endl<<“The midpoint is ”<<xm<<“,”<<ym;cout<<endl<<“The midpoint is ”<<xm<<“,”<<ym;return 0; return 0;

}}

ReviewReview

Declare an integer variable and initialize it to 8Declare an integer variable and initialize it to 8 Give an example of preprocessor directiveGive an example of preprocessor directive What is the name of the function that every C++ What is the name of the function that every C++

program must have?program must have? If A is initialized to 5 and B is initialized to 7 what If A is initialized to 5 and B is initialized to 7 what

are the values of A and B after the following are the values of A and B after the following assignment operation:assignment operation:

B=A;B=A;

A = ________, B = _____________.A = ________, B = _____________.

Review - Review - identify the operationidentify the operation

int num; int num;

num = 5;num = 5;

int num=5; int num=5;

declaration

assignment during declaration initialization

assignment

The grade distribution in a certain class is The grade distribution in a certain class is

as follows:as follows:

HW – 30% - 100 points maxHW – 30% - 100 points max Tests – 45% - 100 points maxTests – 45% - 100 points max Labs - 25% - 100 points maxLabs - 25% - 100 points max

Write an algorithm that will receive the Write an algorithm that will receive the scores in each category of one student scores in each category of one student and display his final grade (out of 100%).and display his final grade (out of 100%).