ASCII文字の16進表現の値を調べる各種の方法 ref: http://qiita.com/comocc/items/0dab7f5aac9dc7e43d07

cr.c

#include <stdio.h>

int main(void)
{
    printf("%x\n", '\n');
    return 0;
}

cr.cpp

#include <iostream>

int main()
{
    std::cout << std::hex << static_cast<int>('\n') << std::endl;
    return 0;
}

file0.txt

$ man ascii

file1.txt

$ node
> console.log('\n'.charCodeAt(0).toString(16));
a

file2.txt

$ ruby -e 'p "\n".ord.to_s(16)'
"a"

file3.txt

$ python -c "print(hex(ord('\n')))"
0xa