Topic: Separators after the decimal place. (Read 1667 times)

1.00143781 = $110.85916557
1.0014378  = $110.85916446
1.001437   = $110.85907590
1.00143    = $110.85830100
1.0014     = $110.85498000
1.001      = $110.81070000

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

# reads a number with thousand separators in it and one character that the value is put into v
# the last character read is left in c.  The first character read in is c after that
# characters are read in from in.
template void read_with_commas(istream& in, fp_type & v, char & c) {
	int sign = 1;
	if (c == '-') {
		sign = -1;
		c = in.get();
	}
	v = 0.0;
	while (c != '.') {
		if (c != ',') {
			if (isdigit(c)) {
				v *= 10;
				v += (c - '0');
			} else {
				return;
			}
		}
		c = in.get();
	}
	if (c == '.') {
		fp_type order = 1;
		c = in.get();
		while (isdigit(c) || c==',') {
			if (c != ',') {
				order /= 10;
				v += order * (c - '0');
			}
			c = in.get();
		}
	}
}


template void print_with_commas(ostream& os, fp_type v) {
		char comma = use_facet >(cout.getloc()).thousands_sep();
		if (v < 0) {
			os << "-";
			v = -v;
		}
		fp_type this_error = v * pow(10,-sig_figs);
		long long integer_part = (long long)v;
		int exp = 0;
		long long power10_exp = 1;
		while (power10_exp * 10 < integer_part) {
			power10_exp *= 10;
			exp++;
		}
		// skip leading zeroes
		while (exp > 0 && (((integer_part / power10_exp) % 10) == 0)) {
			power10_exp /= 10;
			--exp;
		}
		// power_exp < integer_part < power_exp * 10
		int limit = sig_figs;
		while (exp > 0) {
			os << (char)(((integer_part / power10_exp) % 10) + '0');
			power10_exp /= 10;
			if (exp % 3 == 0)
				os << comma;
			--exp;
			--limit;
		}
		os << (char)((integer_part % 10)+'0');
		fp_type dv(v);
		if ((dv - integer_part) != 0 && limit > 0) {
			// now we use for past the decimal place
			os << ".";
			unsigned short digit;
			dv -= integer_part;
			exp = -1;
			while (this_error < dv && --limit > 0) {
				dv *= 10;
				this_error *= 10;
				digit = (unsigned short)dv;
				os << digit;
				if (exp-- % 3 == 0)
					os << comma;
				dv -= digit;
			}				
		}
}


template class btc_complex : public complex {
public:
	btc_complex() : complex() {}
	btc_complex(fp_type x) : complex(x) {}
	btc_complex(fp_type a, fp_type b) : complex(a,b) {}
};

ostream& operator << (ostream& os, const btc_complex z) {
	print_with_commas(os, z.real());
	if (z.imag() != 0) {
		os << "+";
		print_with_commas(os, z.imag());
		os << "I";
	}
	return os;
}
ostream& operator << (ostream& os, const btc_complex z) {
	print_with_commas(os, z.real());
	if (z.imag() != 0) {
		os << "+";
		print_with_commas(os, z.imag());
		os << "I";
	}
	return os;
}
ostream& operator << (ostream& os, const btc_complex z) {
	print_with_commas(os, z.real());
	if (z.imag() != 0) {
		os << "+";
		print_with_commas(os, z.imag());
		os << "I";
	}
	return os;
}

template istream& operator >> (istream& in, btc_complex& z) {
	fp_type real, imag;
	char c = in.get();
	read_with_commas(in, real, c);
	if (c =='I' || c=='i') {
		z = btc_complex(0,real);
	} else if (c == '+') {
		read_with_commas(in, imag, c);
		if (c != 'I') {
			in.setstate(ios::failbit);
		}
		z = btc_complex(real,imag);
	} else {
		z = real;
		in.putback(c);
	}
	return in;
}


struct test_case {
	double val;
	string lit;
}; 

int main(int argc, char **argv) {
    {
    	 
	try {
		cout.imbue(std::locale("en_US"));
	} catch ( ... ) {
		
	}
	
	test_case tests[] = { { 43112279.75467,"43,112,279.754,67"} , {0.0101020204,"0.010,102,020,4"}, {0.00000001,"0.000,000,01"} };
	BOOST_FOREACH(test_case c, tests) {
		ostringstream oss;
		complex oz = c.val;
		btc_complex z = c.val;
		
		try {
			oss.imbue(std::locale("en_US"));
		} catch ( ... ) {
		
		cout << c.val << " = " << z << endl;
		oss << z;
		if (oss.str() == c.lit) {
			cout << "test successful." << endl;
		} else {
			cout << "test failed: expected " << c.lit << ", but got " << oss.str() << endl;
		}
		oss.str( "" );		
	}
	
	BOOST_FOREACH(test_case c, tests) {
		istringstream iss;
		btc_complex z;
		iss.str(c.lit);
		iss >> z;
		if (z == c.val) {
			cout << "test successful." << endl;
		} else {
			cout << "test failed: expected " << c.val << ", but got " << z << endl;
		}
	}

    }

    return 0;
}