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Squares

rascal-0.34.0

Synopsis

Print a list of squares

Examples

How can we print a list of squares? Here is a solution:

import IO;        

@synopsis{Print a table of squares using a for loop and single line string templates}
void squares(int n) {
println("Table of squares from 1 to <n>\n");
for (int I <- [1 .. n + 1])
println("<I> squared = <I * I>");
}

@synopsis{a solution with one multi line string template}
str squaresTemplate(int N)
= "Table of squares from 1 to <N>
'<for (int I <- [1 .. N + 1]) {>
' <I> squared = <I * I><}>";
  • ❶ The IO module is imported since we want to print things using println.

  • String interpolation is used several times. Here the value of N is inserted in the header message.

  • ❸ The values of I and I * I are inserted in each line that is printed.

  • ❹ Define an alternative implementation squareTemplate that is based on string templates and returns a string value instead of printing the results itself.

Here is how square can be used:

rascal>squares(9);
Table of squares from 1 to 9

1 squared = 1
2 squared = 4
3 squared = 9
4 squared = 16
5 squared = 25
6 squared = 36
7 squared = 49
8 squared = 64
9 squared = 81
ok

squaresTemplate gives a similar result but now as a string:

rascal>squaresTemplate(9);
str: "Table of squares from 1 to 9\n\n 1 squared = 1\n 2 squared = 4\n 3 squared = 9\n 4 squared = 16\n 5 squared = 25\n 6 squared = 36\n 7 squared = 49\n 8 squared = 64\n 9 squared = 81"
---
Table of squares from 1 to 9

1 squared = 1
2 squared = 4
3 squared = 9
4 squared = 16
5 squared = 25
6 squared = 36
7 squared = 49
8 squared = 64
9 squared = 81
---

To get a truly identical result we have to import the IO module and print the value of squaresTemplate:

rascal>import IO;
ok
rascal>println(squaresTemplate(9));
Table of squares from 1 to 9

1 squared = 1
2 squared = 4
3 squared = 9
4 squared = 16
5 squared = 25
6 squared = 36
7 squared = 49
8 squared = 64
9 squared = 81
ok