Write a program that reads a number between 0 and 999,999,999,999 from the user, where the user enters a comma in the input. Then print the number without a comma. You should assume the user will give you a number with the commas where they should be. You may NOT use stoi, atoi, stringstream, or any includes other than cmath and string.

Hint: Read the input as a string and loop over the string. Store the result in a long long variable.

One way to do this is to convert to integer one character at a time.

For example:

string s = "324,126"; int i = s.at(2) - '0'; //This will output the integer 4, since it is the 2nd character //(first being character 0) cout << i; 

The - 0 is a trick to convert from ASCII to decimal. See Ascii Table.

-- Please use C++ --