What do these errors mean because I see nothing wrong in the program

[Bopaki]

I get these errors when compiling my program:
C:\Martin\Savitch\SavitchDownloads\Chapter11\Display11.3.cpp:162:2: error: stray '\342' in program
C:\Martin\Savitch\SavitchDownloads\Chapter11\Display11.3.cpp:162:2: error: stray '\210' in program
C:\Martin\Savitch\SavitchDownloads\Chapter11\Display11.3.cpp:162:2: error: stray '\222' in program
C:\Martin\Savitch\SavitchDownloads\Chapter11\Display11.3.cpp: In function 'int digit_to_int(char)':
C:\Martin\Savitch\SavitchDownloads\Chapter11\Display11.3.cpp:162:34: error: expected ')' before 'static_cast'
Process terminated with status 1 (0 minute(s), 0 second(s))
4 error(s), 0 warning(s) (0 minute(s), 0 second(s))

 //Program to demonstrate the class Money.
  #include <iostream>
  #include <cstdlib>
   #include <cctype>
using namespace std;
//Class for amounts of money in U.S. currency.

class Money
{
public:

    friend Money add(Money amount1, Money amount2);
    //Precondition: amount1 and amount2 have been given values.
    //Returns the sum of the values of amount1 and amount2.

    friend bool equal(Money amount1, Money amount2); //Precondition: amount1 and amount2 have been given values.
 //Returns true if the amount1 and amount2 have the same value;
 //otherwise, returns false.
 Money(long dollars,int cents); //Initializes the object so its value represents an amount with the
 //dollars and cents given by the arguments. If the amount is negative,
 //then both dollars and cents must be negative.
 Money(long dollars); //Initializes the object so its value represents $dollars.00.
 Money( ); //Initializes the object so its value represents $0.00.

double get_value( ); //Precondition: The calling object has been given a value.
 //Returns the amount of money recorded in the data of the calling object.

void input(istream& ins); //Precondition: If ins is a file input stream, then ins has already been
 //connected to a file. An amount of money, including a dollar sign, has been
 //entered in the input stream ins. Notation for negative amounts is -$100.00.
 //Postcondition: The value of the calling object has been set to
 //the amount of money read from the input stream ins.

void output(ostream& outs); //Precondition: If outs is a file output stream, then outs has already been
 //connected to a file.
 //Postcondition: A dollar sign and the amount of money recorded
 //in the calling object have been sent to the output stream outs.

private:

long all_cents;
 };

 int digit_to_int(char c);
 //Function declaration for function used in the definition of Money::input:
 //Precondition: c is one of the digits '0' through '9'.
 //Returns the integer for the digit; for example, digit_to_int ('3') returns 3.
 int main( )
 {
 Money your_amount, my_amount(10, 9), our_amount;
 cout << "Enter an amount of money: ";
 your_amount.input(cin);
 cout << "Your amount is ";
 your_amount.output(cout);
 cout << endl;
 cout << "My amount is ";
 my_amount.output(cout);
 cout << endl;
 if (equal(your_amount, my_amount))
 cout << "We have the same amounts.\n";
 else
 cout << "One of us is richer.\n";
 our_amount = add(your_amount, my_amount);
 your_amount.output(cout);
 cout << " + ";
 my_amount.output(cout);
 cout << " equals ";
 our_amount.output(cout);
 cout << endl;
 return 0;
 }
 Money add(Money amount1, Money amount2)
 {
 Money temp;

 temp.all_cents = amount1.all_cents + amount2.all_cents;
return temp;
 }

 bool equal(Money amount1, Money amount2)
 {
 return (amount1.all_cents == amount2.all_cents);
 }

 Money::Money(long dollars, int cents)
 {
 if (dollars * cents < 0) //If one is negative and one is positive
 {
 cout << "Illegal values for dollars and cents.\n";
 exit(1);
 }
 all_cents = dollars * 100 + cents;
 }

 Money::Money(long dollars) : all_cents(dollars * 100)
{
 //Body intentionally blank.
 }

 Money::Money( ) : all_cents(0)
 {
 //Body intentionally blank.
 }

 double Money::get_value( )
 {
 return (all_cents * 0.01);
 }
 //Uses iostream, cctype, cstdlib:
 void Money::input(istream& ins)
 {
 char one_char, decimal_point, digit1, digit2;
 //digits for the amount of cents
 long dollars;
 int cents;
 bool negative;//set to true if input is negative.

 ins >> one_char;
 if (one_char == ' ')
 {
 negative = true;
 ins >> one_char; //read '$'
 }
 else
 negative = false;
 //if input is legal, then one_char == '$'

 ins >> dollars >> decimal_point >> digit1 >> digit2;

 if (one_char != '$' || decimal_point != '.'
 || !isdigit(digit1) || !isdigit(digit2))
{
 cout << "Error illegal form for money input\n";
 exit(1);
 }
 cents = digit_to_int(digit1) * 10 + digit_to_int(digit2);

 all_cents = dollars * 100 + cents;
 if (negative)
 all_cents = -all_cents;
 }
 //Uses cstdlib and iostream:
 void Money::output(ostream& outs)
 {
 long positive_cents, dollars, cents;
 positive_cents = labs(all_cents);
 dollars = positive_cents / 100;
 cents = positive_cents % 100;

 if (all_cents < 0)
 outs << "-$" << dollars << '.';
 else
 outs << "$" << dollars << '.';

 if (cents < 10)
 outs << '0';
 outs << cents;
 }

 int digit_to_int(char c)
 {
 return (static_cast<int>(c) − static_cast<int>('0'));
 }

[Repeater]

It means that you've used characters that aren't permitted.

See this line:
return (static_cast<int>(c) − static_cast<int>('0'));

See that symbol in the middle:
−

That's a forbidden symbol. You can only use the basic character set. I bet you meant that to be the minus symbol.

What you typed: −
What you meant: -

See the difference? I don't know where you got that symbol, but it's not permitted in a C++ program.

[Bopaki]

Thank you very much !!! Repeater. I have never seen this error before.
May program ran fine after fixing that symbol

[salem c]

You often get "stray xxx in program" when you copy/paste from some web page / word document / pdf document which has substituted certain characters for something more visually appealing.

A common thing is to turn "" into “”