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

2 votes151 views1 answer
How to make for loop in c++
C++
0 vote149 views1 answer
Iteraate through a vector
C++
-1 vote137 views1 answer
Fast way to check if a number is prime C++
C++
0 vote136 views1 answer
Shift element to end of vector c++
C++
1 vote162 views1 answer
C++ encapsulation
C++
0 vote152 views1 answer
Ascii allowed in c++
C++
25 votes140 views10 answers
Translate
C++
0 vote179 views1 answer
The statement vector vector int matrix(100 vector int (50 100) ) declares
C++
2 votes114 views1 answer
Check compiler version c++
C++
11 votes132 views1 answer
Removing a character from a string in c++
C++