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

0 vote127 views1 answer
Cosnt cast
C++
6 votes129 views3 answers
Sstream c++
C++
1 vote155 views1 answer
Lpcwstr to string c++
C++
0 vote138 views1 answer
Zero fill in c++
C++
0 vote150 views1 answer
How to read wav file in C++
C++
0 vote119 views1 answer
C++ shift array to the right
C++
0 vote87 views2 answers
Average of vector c++
C++
0 vote129 views1 answer
Binary search c++
C++
0 vote126 views1 answer
Random 1 diem tren man hinh bang dev c
C++
0 vote136 views1 answer
Break input stream into words
C++