What s[i]-'0' does

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

What s[i]-'0' does

    '0' - 48
    '1' - 49
    '2' - 50
    '3' - 51
    '4' - 52
    '5' - 53
    '6' - 54
    '7' - 55
    '8' - 56
    '9' - 57

Source: stackoverflow.com

Similar codes

1 vote332 views1 answer
C++ shortcuts in desktopp app
C++
0 vote343 views1 answer
Add for input output file in c/c++
C++
38 votes413 views6 answers
How to print hello world in c++
C++
0 vote364 views1 answer
C++ schleife abbrechen
C++
0 vote644 views1 answer
Sfml hide message
C++
0 vote318 views1 answer
C++ define constant in class header
C++
0 vote339 views1 answer
How to allocate memory for vector c++
C++
0 vote403 views3 answers
C++ program to convert celsius to kelvin
C++
5 votes309 views2 answers
Best way to take input in cpp
C++
0 vote348 views1 answer
Ex: cpp
C++