Exercise: Sum of numbers in a file

Let's implement something slightly useful.

In this exercise we have a file called numbers.txt that has numbers in it. Each line is a number.

Our aim is to add the numbers and print the result.

examples/data/numbers.txt

3
7
23
0
-17
98
12

Expected result is 126.

Tools

Some of the tools you might need to solve this exercise.

• Perl:

  • Scalar values and variabels in Perl

  • Numerical operators in Perl

  • Open file in Perl

  • Perl while loop

• Ruby:

  • Open file and read content line-by-line in Ruby

  • Convert string to number in Ruby

  • For the advanced version:

  • map in Ruby

  • reduce in Ruby

• Python:

  • Open file in Python

Solutions

• Python: sum of numbers
• Perl 5: sum of numbers in a file
• Ruby: sum of numbers in a file
• Groovy: sum of numbers