//This Programme Converts a given decimal number in the range [0,4000) //to both Lower case and Upper case Roman Numeral #include #include #include #include using namespace std; //This functions fills a string with character c, n times and returns it string fill( char c, int n ) { string s; while( n-- ) s += c; return s; } //to convert to lowercase Roman Numeral string tolowerRoman( int n ) { if( n < 4 ) return fill( 'i', n ); if( n < 6 ) return fill( 'i', 5 - n ) + "v"; if( n < 9 ) return string( "v" ) + fill( 'i', n - 5 ); if( n < 11 ) return fill( 'i', 10 - n ) + "x"; if( n < 40 ) return fill( 'x', n / 10 ) + tolowerRoman( n % 10 ); if( n < 60 ) return fill( 'x', 5 - n / 10 ) + 'l' + tolowerRoman( n % 10 ); if( n < 90 ) return string( "l" ) + fill( 'x', n / 10 - 5 ) + tolowerRoman( n % 10 ); if( n < 110 ) return fill( 'x', 10 - n / 10 ) + "c" + tolowerRoman( n % 10 ); if( n < 400 ) return fill( 'c', n / 100 ) + tolowerRoman( n % 100 ); if( n < 600 ) return fill( 'c', 5 - n / 100 ) + 'd' + tolowerRoman( n % 100 ); if( n < 900 ) return string( "d" ) + fill( 'c', n / 100 - 5 ) + tolowerRoman( n % 100 ); if( n < 1100 ) return fill( 'c', 10 - n / 100 ) + "m" + tolowerRoman( n % 100 ); if( n < 4000 ) return fill( 'm', n / 1000 ) + tolowerRoman( n % 1000 ); return "?"; } //to convert to uppercase Roman Numeral string toupperRoman( int n ) { if( n < 4 ) return fill( 'I', n ); if( n < 6 ) return fill( 'I', 5 - n ) + "V"; if( n < 9 ) return string( "V" ) + fill( 'I', n - 5 ); if( n < 11 ) return fill( 'I', 10 - n ) + "X"; if( n < 40 ) return fill( 'X', n / 10 ) + toupperRoman( n % 10 ); if( n < 60 ) return fill( 'X', 5 - n / 10 ) + 'L' + toupperRoman( n % 10 ); if( n < 90 ) return string( "L" ) + fill( 'X', n / 10 - 5 ) + toupperRoman( n % 10 ); if( n < 110 ) return fill( 'X', 10 - n / 10 ) + "C" + toupperRoman( n % 10 ); if( n < 400 ) return fill( 'C', n / 100 ) + toupperRoman( n % 100 ); if( n < 600 ) return fill( 'C', 5 - n / 100 ) + 'D' + toupperRoman( n % 100 ); if( n < 900 ) return string( "D" ) + fill( 'C', n / 100 - 5 ) + toupperRoman( n % 100 ); if( n < 1100 ) return fill( 'C', 10 - n / 100 ) + "M" + toupperRoman( n % 100 ); if( n < 4000 ) return fill( 'M', n / 1000 ) + toupperRoman( n % 1000 ); return "?"; } //main function int main() { int n; cin >> n; cout << n << " in Upper Roman Numerals is " << toupperRoman(n) << "\n"; cout << n << " in Lower Roman Numerals is " << tolowerRoman(n) << "\n"; return 0; }