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what s[i]-'0' does

By ViperViper on Aug 23, 2020
It seems that s is a character array or a pointer to the first 
element of a character array. And element s[i] contains a character
that represents a digit as for example '5' . To convert this character
that for example in ASCII has internal code equal to 53 
(while internal code of character '0' is 48) there is used expression

s[i] -'0'
that is equivalent to

53 - 48
and equal to number 5

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what s[i]-'0' does

By ViperViper on Aug 23, 2020
    '0' - 48
    '1' - 49
    '2' - 50
    '3' - 51
    '4' - 52
    '5' - 53
    '6' - 54
    '7' - 55
    '8' - 56
    '9' - 57

Source: stackoverflow.com

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