Accumulate over a File Harder Examples

Accumulator Tutorials

Adding and Counting

Two Accumulators

Checking an Array

Building Strings

Using a file

Multiple Variables

Searching for Values

Harder Examples

Reprise

Average Name Length

What is the average length of Country name (to two decimal places).

.

import java.io.BufferedReader; import java.io.FileReader; public class Cia { public static void main(String[] argv) throws Exception { BufferedReader fh = new BufferedReader(new FileReader("cia.txt")); String line; while ((line=fh.readLine())!=null) { String [] wrds = line.split("\t"); String name = wrds[0]; } } }

[Font] [Default] [Show] [Resize] [History] [Profile]

test text

 

 

 

 

Benford's Law

Show the distribution of the first digit of the population for countries of the world. Show percentages, be sure to round, ignore countries with population 0.

The output is as shown. Note that 27% of countries have populations that start with the digit 1, only 19% start with a 2 ...

1  27%
2  19%
3  11%
4  12%
5   6%
6   9%
7   6%
8   6%
9   3%

.

import java.io.BufferedReader; import java.io.FileReader; import java.util.TreeMap; public class Benford { public static void main(String[] argv) throws Exception { BufferedReader fh = new BufferedReader(new FileReader("bbc.txt")); String line; while ((line=fh.readLine())!=null) { String [] wrds = line.split("\t"); String name = wrds[0]; int pop = Integer.parseInt(wrds[3]); } } }

[Font] [Default] [Show] [Resize] [History] [Profile]

test text

 

 

 

 

Accumulator Tutorials

Adding and Counting

Two Accumulators

Checking an Array

Building Strings

Using a file

Multiple Variables

Searching for Values

Harder Examples

Reprise