Exercise: Multiplication Table

Write a console program that:

Asks the user to enter a single number from the user. This number specifies the number of rows and columns of the multiplication table. The number has to be between 1 and 10.

Prints each row of the multiplication table.

Uses the borders around numbers shown in the example outputs below.

green

Number of rows and columns (between 1 and 10): 3 +---+---+---+ | 1| 2| 3| +---+---+---+ | 2| 4| 6| +---+---+---+ | 3| 6| 9| +---+---+---+

Number of rows and columns (between 1 and 10): 10 +---+---+---+---+---+---+---+---+---+---+ | 1| 2| 3| 4| 5| 6| 7| 8| 9| 10| +---+---+---+---+---+---+---+---+---+---+ | 2| 4| 6| 8| 10| 12| 14| 16| 18| 20| +---+---+---+---+---+---+---+---+---+---+ | 3| 6| 9| 12| 15| 18| 21| 24| 27| 30| +---+---+---+---+---+---+---+---+---+---+ | 4| 8| 12| 16| 20| 24| 28| 32| 36| 40| +---+---+---+---+---+---+---+---+---+---+ | 5| 10| 15| 20| 25| 30| 35| 40| 45| 50| +---+---+---+---+---+---+---+---+---+---+ | 6| 12| 18| 24| 30| 36| 42| 48| 54| 60| +---+---+---+---+---+---+---+---+---+---+ | 7| 14| 21| 28| 35| 42| 49| 56| 63| 70| +---+---+---+---+---+---+---+---+---+---+ | 8| 16| 24| 32| 40| 48| 56| 64| 72| 80| +---+---+---+---+---+---+---+---+---+---+ | 9| 18| 27| 36| 45| 54| 63| 72| 81| 90| +---+---+---+---+---+---+---+---+---+---+ | 10| 20| 30| 40| 50| 60| 70| 80| 90|100| +---+---+---+---+---+---+---+---+---+---+

Number of rows and columns (between 1 and 10): 0 0 is too low Number of rows and columns (between 1 and 10): 21 21 is too high Number of rows and columns (between 1 and 10): 1 +---+ | 1| +---+

Hints 💡

General

To speed up development, you can hardcode the number of rows and columns to, for example, 3. This way, you can test your program without having to enter a number each time.
Break this exercise down into smaller steps:
- Maybe start by writing a program that prints only a single row of the multiplication table.
- Then expand the program to print multiple rows.
- Ask yourself if you want to add the borders around the numbers before or after you print the numbers successfully.
This exercise lends itself well to using nested for loops.

`printf`

To make each cell in the table have the same width, you can use the printf method with a format string that specifies the width of the cell. For example, to print a number with a width of 3 characters, you can use the format string "%3d". If the number is shorter than 3 digits, the printf method will add spaces to the left of the number to make it 3 characters wide:

int product = outer * inner;
System.out.printf("%3d", product);
// Prints "  3" without quotes

Exercise: Multiplication Table

Hints 💡

General

printf

Hand in instructions

`printf`