What is the difference between 5 and '5'
12 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Jonathan Mendoza
le 27 Août 2019
Commenté : Bruno Luong
le 30 Août 2019
5 + 1 = 6
'5' + 1 = 54
Why does the seceond line equal 54???
What does '' around numbers???
2 commentaires
Bruno Luong
le 30 Août 2019
Associativity warning
>> "5"+1+2
ans =
"512"
>> 1+2+"5"
ans =
"35"
Réponse acceptée
Bruno Luong
le 27 Août 2019
Modifié(e) : Bruno Luong
le 27 Août 2019
The '5' is the char array. Char array contain a text including number, such as 'Schrodinger has 2 dogs and 1/2 cat'. Char array uses ASCII code internally (actually UNICODE) and the ascii code of '5' is 53, therefore '5'+1 = 53+1 = 54
5 (without quote) is number 5, where the arithmetics operations has standard meaning.
2 commentaires
Walter Roberson
le 28 Août 2019
There are deep historical reasons why the digits are not the first 10 positions in the character codes. It goes back to Morse code and the fact that Morse originally had no digits, and it goes back to mechanical selector lines...
For a while it looked like BCD or later EBCDIC would become the standard. EBCDIC coded '0' as the character after '9'.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Text Files dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!