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Problem: Convert numbers to convert to integer type > Write a program that receives the characters that represent the numbers 0-9 that the user enters. The received character is converted to the same number (range from 0 to 9), and the converted number is displayed as a result.

With this kind of content, in the example answer, subtraction was performed using the fact that there is always a difference of 48 between the character string numerical value and the integer value of the ASCII character code. (In the case of character string 0, "7" is the integer value 7 that you want to find with the character code 55, so the difference is 48)

C ++ depicted as this answer

char digit;
cout << "Enter a one-digit number: ";
cin >> digit;
int sum = digit - '0';
cout << "Is the sum of digits " << sum << "? \n";

Your answer

#!/usr/bin/env python
#coding:utf-8

###def number(x):
###    print("Enter a one-digit number:",x)
###    digit = ord(x) 
###    sum = digit - ord('0')
###    print("Is the sum of digits:",sum)

###・ ・ ・ ・(Execution result on the terminal)
###>>> from ascii import number
###>>> number(str(7))
###Enter a one-digit number: 7
###Is the sum of digits: 7

(Hereafter, the correction code is described)//Thank you for the edit code
from ConsoleOut import cout

def number():
    cout << "Enter a one-digit number: "
    digit = input()
    value = int(digit)
    cout << "The numerical value of the digit is:"+str(valule)+"\n"

・ ・ ・ ・ (On the terminal)
>>> number()
Enter a one-digit number: 7
The numerical value of the digit is:7

I feel that I learned a little about ASCII character encoding in this problem. But what other scenes do you use this ASCII character code for? Unicode and ASCII code I copied and pasted without thinking too much, so it was an opportunity to think about it.

From a book that programmers can learn: Converting characters that represent numbers to integer types