function - C++ : What is the usage of int('0') in this code? -


this question has answer here:

this code find sum of digits occur in string.

example

sumupnumbers("2 apples, 12 oranges") = 5 //2+1+2

can explain need use int('0') in code!?

int sumupdigits(std::string inputstring) {    int answer = 0;    (int = 0; < inputstring.size(); i++) {       if ('1' <= inputstring[i] && inputstring[i] <= '9') {       answer += int(inputstring[i]) - int('0');     }   }    return answer; }

it converts char ascii code make number out of string

int('9') - int('0') = 9

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