Help with 64bit data types


using namespace std;

int main(){

string y;


int64_t z;

z=stoull(y); //214

double x=stod(y);

double d= x-z;



I have a code which has a function something like the above code ,When i run this code and input the value of string as something like “265.145” , it works normally,but when i input the value as big as"5415485451447454554545415454.84845151151511515151515151"

It throws an error saying “terminate called after throwing an instance of ‘std out of range’ what():stoull”

Plz help me fix it