filesize.cpp

#include <iostream>
#include <fstream>
 
/*!
    @param[in]  path    path of a file
    @return byte size of a file (return -1 when file cannnot open)
 */
int filesize(char const * path)
{
    std::ifstream fin(path, std::ios::in | std::ios::ate);
    return fin ? static_cast<int>(fin.tellg()) : -1;
}
 
int main()
{
    std::cout << filesize("filesize.cpp") << std::endl;
}