append_exponent()

JSON_HEDLEY_RETURNS_NON_NULL char * nlohmann::detail::dtoa_impl::append_exponent ( char *  buf, int  e  )

inline

appends a decimal representation of e to buf

Returns

a pointer to the element following the exponent.

Precondition

-1000 < e < 1000

Definition at line 16411 of file json.hpp.

{
    JSON_ASSERT(e > -1000);
    JSON_ASSERT(e <  1000);
 
    if (e < 0)
    {
        e = -e;
        *buf++ = '-';
    }
 
    else
    {
        *buf++ = '+';
    }
 
    auto k = static_cast<std::uint32_t>(e);
 
    if (k < 10)
    {
        // Always print at least two digits in the exponent.
        // This is for compatibility with printf("%g").
        *buf++ = '0';
        *buf++ = static_cast<char>('0' + k);
    }
 
    else if (k < 100)
    {
        *buf++ = static_cast<char>('0' + k / 10);
        k %= 10;
        *buf++ = static_cast<char>('0' + k);
    }
 
    else
    {
        *buf++ = static_cast<char>('0' + k / 100);
        k %= 100;
        *buf++ = static_cast<char>('0' + k / 10);
        k %= 10;
        *buf++ = static_cast<char>('0' + k);
    }
 
    return buf;
}