Why we subtract a char to '0' < String to Integer Recursion >

#1

why we subtract a char to ‘0’, & how it convert a char to digit by subtracting it.

int digit=a[n-1]-‘0’;

#2

Hello @rprahulpal03 this is because as a character or a string are stored according to theri ASCII value and ascii value of numbers start from 48 i.e 0 and 1 is 49
so if the string at that particular index is 1i.e 49 in ascii value so if we will subtract 0 from it then the result will be 49-48 =1.
that is why we subtract 0 from it.
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#3

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