Lecture videos

You should change the quality to the highest setting. And I’m sorry that I say “uh” a lot—at least you can watch at twice the speed and get it over with!

• Precedence, assigning using constructors, cerr (watch this first): https://www.youtube.com/watch?v=J5mCrJ3yUlg
• Main lecture: https://www.youtube.com/watch?v=06yplj26938

Code from lecture

https://github.com/ucsb-cs16-s19-nichols/code-from-class/tree/master/04-09

Topics

Working with doubles

• Evaluating expressions with mixed numeric types
• Typecasting int to double
• Formatted output with doubles:

Comment each line of code. What is the output of the code?

int i = 10;
double j = 1/static_cast<double>(i);
cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(3);
cout<<j<<endl;

Practice with single for loops

• Summing a series:

Exercise: Write a program that takes a parameter n as a command line arguments and computes the following:

1 + 1/2 + 1/3 + ....+ 1/n

where n is the number of terms in the series. Sample run of the program is below:

$./sumSeries 2
Sum of the first 2 terms is: 1.500

Nested Loops

ASCII Art with nested loops

Math Puzzle

One of the powers of computing is being able to do a brute-force search for a solution to a problem. Trial and error works just fine for some problems. In fact, computers can be especially good at such problems. Consider this:

Horses cost $10, pigs cost $3, and rabbits are only $0.50. A farmer buys 100 animals for $100, How many of each animal did he buy?

Write a program to do this.

Precedence