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POstring to float in gcc
 

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  1. POstring to float in gcc
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    <pre><code>#include &lt;iostream&gt; #include &lt;stdlib.h&gt; using namespace std; int main() { string a; cin&gt;&gt;a; float v=strtof(a.c_str(),NULL); cout&lt;&lt;v; } </code></pre> <p>The above code works in g++ compiler. But in gcc its reporting following error. </p> <pre><code>/tmp/ccz60ueB.o: In function `main': test1.cpp:(.text+0x12): undefined reference to `std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;::basic_string()' test1.cpp:(.text+0x21): undefined reference to `std::cin' test1.cpp:(.text+0x26): undefined reference to `std::basic_istream&lt;char, std::char_traits&lt;char&gt; &gt;&amp; std::operator&gt;&gt;&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;(std::basic_istream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;&amp;)' test1.cpp:(.text+0x32): undefined reference to `std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;::c_str() const' test1.cpp:(.text+0x55): undefined reference to `std::cout' test1.cpp:(.text+0x5a): undefined reference to `std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;::operator&lt;&lt;(float)' test1.cpp:(.text+0x66): undefined reference to `std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;::~basic_string()' test1.cpp:(.text+0x81): undefined reference to `std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;::~basic_string()' /tmp/ccz60ueB.o: In function `__static_initialization_and_destruction_0(int, int)': test1.cpp:(.text+0xac): undefined reference to `std::ios_base::Init::Init()' test1.cpp:(.text+0xb1): undefined reference to `std::ios_base::Init::~Init()' /tmp/ccz60ueB.o:(.eh_frame+0x13): undefined reference to `__gxx_personality_v0' collect2: ld returned 1 exit status </code></pre>
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    1. COWhy are you trying to compile a C++ program with a C compiler?
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    2. COYou also need `#include <string>`
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      1. USBen Voigt
    3. COWhat did you expect it to do? You can't write C++ and then compile it with a C compiler. You'd have just as much luck trying to compile it with the Java compiler.
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      1. USBrian Roach
 

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