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 vote150 views1 answer
How to write a conclusion statement for an informative essay
C++
0 vote146 views1 answer
Macro c++
C++
1 vote145 views2 answers
Length of number c++
C++
0 vote145 views1 answer
Youtube to facebook link converter
C++
0 vote174 views1 answer
How can I convert each and every element of string push into set in c++?
C++
3 votes150 views1 answer
Friend function in c++
C++
2 votes98 views1 answer
Ascii to char c++
C++
1 vote141 views1 answer
C++ evaluate expression
C++
1 vote202 views1 answer
On component end overlap c++
C++
-1 vote212 views1 answer
How to replace an element in array in c++
C++