Decimal to Roman Numeral Conversion

John — Thu, 21 May 2009 06:07:44 +0000

[code lang="cpp"]#include
#include
using namespace std;

string dec_to_numeral(int x) {
int dec[13] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
string num[13] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
string numeral;

for(int i = 0; i < 13; i++) {
while (x >= dec[i]) {
x -= dec[i];
numeral.append(num[i]);
}
}

return numeral;
}

int main() {
//example
cout << dec_to_numeral(400);

return 0;
}[/code]

Monte Carlo Generation of Pi

John — Thu, 21 May 2009 05:34:44 +0000

[code lang="cpp"]#include
#include
#include
#include
int main ()
{
int in = 0;
srand(time(NULL));

for(int i = 0; i < 1000000; i++) {
float x = (rand()%1000000)/1000000.0;
float y = (rand()%1000000)/1000000.0;
double r = sqrt((pow(x,2)+pow(y,2)));
if(r <= 1) in++;
}
printf("percent error=%fn", ((((4*in/1000000.0)-3.141592)/3.141592)*100));
printf("pi=%fn", (4*in/1000000.0));
return 0;
}
[/code]

Compiled Thoughts by John Ciacia » cpp

Decimal to Roman Numeral Conversion

Monte Carlo Generation of Pi