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error "float.h" file not found



  • My compiler is minGW730 , and when I write #include <bits/stdc++.h> or #include <float.h> or #include <cfloat> in my code. This Warnings always pops out and tells me that "float.h" not found. I don't know how to deal with it.
    #include <bits/stdc++.h>:
    41bce7fd-3648-4fdd-9e8a-7e9be80cdf60-image.png
    #include <float.h>:
    fa37e20b-84df-4831-b8ab-3781d72e5ca6-image.png
    #include <cfloat>:
    7fef18de-a423-493c-8eff-3225d6002729-image.png



  • I think the more general question is important: Why are you directly including bits/stdc++.h? The C++ convention for header files is to include the libc++ header file equivalents of their C counterparts...So

    <float.h> becomes <cfloat>
    <assert.h> becomes <cassert>
    <math.h> becomes <cmath>

    Get it now?



  • Here is the content of <bits/stdc++.h>:
    // C++ includes used for precompiling -- C++ --

    // Copyright (C) 2003-2017 Free Software Foundation, Inc.
    //
    // This file is part of the GNU ISO C++ Library. This library is free
    // software; you can redistribute it and/or modify it under the
    // terms of the GNU General Public License as published by the
    // Free Software Foundation; either version 3, or (at your option)
    // any later version.

    // This library is distributed in the hope that it will be useful,
    // but WITHOUT ANY WARRANTY; without even the implied warranty of
    // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    // GNU General Public License for more details.

    // Under Section 7 of GPL version 3, you are granted additional
    // permissions described in the GCC Runtime Library Exception, version
    // 3.1, as published by the Free Software Foundation.

    // You should have received a copy of the GNU General Public License and
    // a copy of the GCC Runtime Library Exception along with this program;
    // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
    // http://www.gnu.org/licenses/.

    /** @file stdc++.h
    This is an implementation file for a precompiled header.
    **/

    // 17.4.1.2 Headers

    // C
    #ifndef _GLIBCXX_NO_ASSERT
    #include <cassert>
    #endif
    #include <cctype>
    #include <cerrno>
    #include <cfloat>
    #include <ciso646>
    #include <climits>
    #include <clocale>
    #include <cmath>
    #include <csetjmp>
    #include <csignal>
    #include <cstdarg>
    #include <cstddef>
    #include <cstdio>
    #include <cstdlib>
    #include <cstring>
    #include <ctime>

    #if __cplusplus >= 201103L
    #include <ccomplex>
    #include <cfenv>
    #include <cinttypes>
    #include <cstdalign>
    #include <cstdbool>
    #include <cstdint>
    #include <ctgmath>
    #include <cuchar>
    #include <cwchar>
    #include <cwctype>
    #endif

    // C++
    #include <algorithm>
    #include <bitset>
    #include <complex>
    #include <deque>
    #include <exception>
    #include <fstream>
    #include <functional>
    #include <iomanip>
    #include <ios>
    #include <iosfwd>
    #include <iostream>
    #include <istream>
    #include <iterator>
    #include <limits>
    #include <list>
    #include <locale>
    #include <map>
    #include <memory>
    #include <new>
    #include <numeric>
    #include <ostream>
    #include <queue>
    #include <set>
    #include <sstream>
    #include <stack>
    #include <stdexcept>
    #include <streambuf>
    #include <string>
    #include <typeinfo>
    #include <utility>
    #include <valarray>
    #include <vector>

    #if __cplusplus >= 201103L
    #include <array>
    #include <atomic>
    #include <chrono>
    #include <codecvt>
    #include <condition_variable>
    #include <forward_list>
    #include <future>
    #include <initializer_list>
    #include <mutex>
    #include <random>
    #include <ratio>
    #include <regex>
    #include <scoped_allocator>
    #include <system_error>
    #include <thread>
    #include <tuple>
    #include <typeindex>
    #include <type_traits>
    #include <unordered_map>
    #include <unordered_set>
    #endif

    #if __cplusplus >= 201402L
    #include <shared_mutex>
    #endif



  • @Kent-Dorfman I have updated my problem. I think you get in the wrong way:)



  • @Kent-Dorfman By the way, in bits/stdc++.h, all the header it includes don't have a ".h" at the end. So the problem is from <cfloat>, not bits/stdc++.h :)



  • If a basic C++ program cannot find <cfloat> then the environment is corrupted in some way...But, you should NEVER have to include bits/stdc++.h directly. It may be implicitely included by that application layer headers but you never do it yourself.


  • Qt Champions 2019

    @PikaCat What you're seing are warnings/errors from code model. Your app should compile just fine. You can disable CLang code model in QtCreator if it does not work properly (in fact it is knows to cause problems).


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