This is METAFONT, Version 2.718281 (TeX Live 2013) (base=mf 2020.8.21)  26 JAN 2021 09:05
**print_integer.h 0730-print_integer.h
(print_integer.h
>> //HEADER.FILE#ifndef.__PRINT_INTEGER_H__#define.__PRINT_INTEGER_H__.void.pri
nt_integer
! Isolated expression.
<to be read again> 
                   (
l.6 void print_integer(
                       int n, int radix, char* prefix);
? 
! Emergency stop.
<to be read again> 
                   (
l.6 void print_integer(
                       int n, int radix, char* prefix);
End of file on the terminal!