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#include<iostream>
using namespace std;
int r2a( char ch )
{
switch( ch ) {
case 'I': return 1;
case 'V': return 5;
case 'X': return 10;
case 'L': return 50;
case 'C': return 100;
case 'D': return 500;
case 'M': return 1000;
default: return 0;
}
}
char a2r( int n )
{
switch( n ) {
case 1: return 'I';
case 5: return 'V';
case 10: return 'X';
case 50: return 'L';
case 100: return 'C';
case 500: return 'D';
case 1000: return 'M';
default: return '\0';
}
}
void roman( int m ){
int remain, count,i;
char ch;
int a[] = {1,5,10,50,100,500,1000};
remain = m;
if( m==0 ) cout << "ZERO" ;
i = 7;
while(remain && i>0){
i--;
count = remain / a;
ch = a2r(a);
for( int j=0;j<count;j++) cout << ch;
remain -= count * a;
if ( remain < a- (i==0 ? 0 : a[i-(i%2?1:2)]) ) continue;
if( remain >= a - 1) {
cout << 'I' << ch ;
remain -= (a-1);
}else if( remain >= a-10){
cout << 'X' << ch ;
remain -= (a-10);
}else if( remain >= a -100){
cout << 'C' << ch ;
remain -= (a-100);
}
}
}
int main()
{
int r;
cout << "Input a number(I,V,X,L,C,D,M來代表1,5,10,50,100,500,1000):";
cin >> r;
roman(r);
return 0;
}
有大哥大姐可以簡單解釋紅色字的用途嗎? |
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發表於 2016-11-20 16:46:01
