Problem You require an algorithm that will receive

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

Problem angle 1 side 1 hyp angle 2 side 2

Defining Diagram Inputs hyp side 1 Processing Prompt for and get hyp and side 1 Calculate side 2 (Pythagorean theorem) Calculate angle 1 and angle 2 Display results Output side 2 angle 1 angle 2

Calculate_Side_and_Angles Prompt user for hyp and side 1 Get hyp and side 1 side 2 = hyp*hyp – side 1*side 1 side 2 = SQRT(side 2) angle 1 = ARCSIN (side 2/hyp) angle 2 = 90 – angle 1 Display side 2, angle 1 and angle 2 END

Basic Elements of C++

# include <iostream> using namespace std; int main() { cout<<“Hello world!”; return 0; } Preprocessor directive Function main Curly braces Semicolons

# include <iostream> using namespace std; int main() { cout<<“Hello world!”; return 0; }

# include <iostream> using namespace std; void main() { cout<<“Hello world!”; return; }

/* This is our first C++ program Oh, how exciting!!!!! */ # include <iostream> using namespace std; //this is preprocessor directive int main() //this is our first function { cout<<“Hello world!”; return 0; }

Variables l Identifiers can consist of l Letters l Digits (but cannot start with digits) l Underscore character Identifiers are case sensitive. Identifiers should be self-explanatory.

l l l l l price+tax My Number costofthepurchase _total_sum one*two Valid Identifiers? pay$ xcsrtysb Average_Age 3 rd_side

C++ Data Types Simple l Structured l Pointers l

Basic Data Types Integer - int l Floating point value – float, double l Character - char l Boolean - bool l

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 3. 3 -4 39. 001 0 0. 0 ‘d’ ‘Bob’ 9. 0 +123 ‘’

Variable Declaration data-type variable-name , var-name… optional int num; float price 1, price 2; double average; char letter_grade;

Variable Initialization l l l int a=3; //initialization int a; a=3; //assignment int a; cin>>a; //input data

# include <iostream> using namespace std; int main() { int age; cout<<“Enter your age”; cin >>age; cout<<endl<<“You are ”<<age; return 0; }

Calculate_Midpoint Prompt user for x 1, y 1, x 2, y 2 Get x 1, y 1, x 2, y 2 xm=(x 1+x 2)/2 ym=(y 1+y 2)/2 Display xm and ym END

# include <iostream> using namespace std; int main() { int x 1, y 1, x 2, y 2, xm, ym; cout<<endl<<“Enter the coordinates of the 1 st point”; cin >>x 1 >>y 1; cout<<endl<<“Enter the coordinates of the 2 nd point”; cin>>x 2 >>y 2; xm=(x 1+x 2)/2; ym=(y 1+y 2)/2; cout<<endl<<“The midpoint is ”<<xm<<“, ”<<ym; return 0; }

Review l l Declare an integer variable and initialize it to 8 Give an example of preprocessor directive What is the name of the function that every C++ program must have? If A is initialized to 5 and B is initialized to 7 what are the values of A and B after the following assignment operation: B=A; A= ____, B = _______.

Review - identify the operation l int num; declaration l num = 5; assignment l int num=5; assignment during declaration initialization

The grade distribution in a certain class is as follows: l l l HW – 30% - 100 points max Tests – 45% - 100 points max Labs - 25% - 100 points max Write an algorithm that will receive the scores in each category of one student and display his final grade (out of 100%).