modf() c++
#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
#define prec cout<<fixed<<setprecision(8);
int main ()
{
double param, fractpart, intpart;
prec
param = 3.14159265;
fractpart = modf (param , &intpart); // Break into fractional and integral parts (function )
cout<< param<<" = ("<<intpart<<" + "<<fractpart<<")"; // 3.14159265 = (3.00000000 + 0.14159265)
}