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

3 votes125 views1 answer
C++ check if string contains uppercase
C++
3 votes132 views1 answer
Sfml draw line
C++
1 vote143 views1 answer
How to lock window resize c++ sfml'
C++
0 vote125 views1 answer
Fast i/o in c++
C++
0 vote150 views1 answer
C++ with SVD
C++
0 vote121 views1 answer
Accpt array input in single line in cpp
C++
1 vote132 views2 answers
Convert from hex to decimal c++
C++
3 votes126 views2 answers
Convert binary string to int c++
C++
0 vote121 views1 answer
C++ get string between two characters
C++
7 votes147 views3 answers
Setprecision in c++
C++