Question

Why this code does not work ?

#include <iostream>
#include <cstdio>
int main() {
  printf("%X", 1327644190303473294);
}

I am getting o/p 5f264e8e

but expected o/p is 126cbd5b5f264e8e as given by below php script

<?php
  echo dechex(1327644190303473294);
?>

Answer 1

The portable way to do this is to

#include <inttypes.h>

And to do:

#include <stdio.h> 
#include <inttypes.h>  // for PRIX64 macro (and INT64_C macro from stdint.h)

int main(void) 
{
    printf("The value is %"PRIX64"\n", INT64_C(1327644190303473294));
    return 0;
}