Question

Create a simple EBNF that covers decimal numbers with punctuation including commas, decimal point, and sign (+/-).

Valid numbers:

• 0
• -1
• -1.0
• 0.0
• 10.0
• 1,000,000.58286262353623629823698203986902836

Answer 1

digit = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

wholeNumber = digit {digit};

integer = ["+"|"-"] wholeNumber;

real = integer "." wholeNumber;

formatted = integer {"," wholeNumber} ["." wholeNumber];

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Explaination :

digit ==>Numbers from 0 to 9

wholeNumber ==> whole number consist of atleast one digit followed by zero or more digits

integer ==> integers are just whole numbers with optional sign of + or - in front of them

real ==> are integers plus a decimal followed by whole numbers

formatted ==> It contains , as well it is integer followed by a sequence of zero or more combination of , and whole number and finally if decimal then followed by whole numbers which is optional