`Why undefined reference to `getch'
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<div class="content__item-top-div"> <a class="content__item-top-name" href="#!">DVoropaev</a><span class="content__item-top-p">2017-08-27 21:44:32</span></div>
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<div class="content__item-row dn"> <a href="#!"><b>DVoropaev</b>,</a> 2017-08-27 21:44:32</div>
<p class="content__item-title large">Why undefined reference to `getch'?</p>
<p class="content__item-detail sm">
<pre><code class="c hljs cpp"><span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string"><ctype.h></span></span>
<span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string"><stdio.h></span></span>
<span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">(<span class="hljs-keyword">void</span>)</span></span>{
<span class="hljs-keyword">char</span> ch = getch();
<span class="hljs-built_in">printf</span>(<span class="hljs-string">"%c"</span>, getch);
ungetch(ch);
ch = getch();
<span class="hljs-built_in">printf</span>(<span class="hljs-string">"%c"</span>, ch);
<span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;
}</code></pre><br><pre><code class="hljs">$ gcc ./main.c
./main.c: In function ‘main’:
./main.c:5:12: warning: implicit declaration of function ‘getch’ [-Wimplicit-function-declaration]
char ch = getch();
^
./main.c:6:9: warning: format ‘%c’ expects argument of type ‘int’, but argument 2 has type ‘int (*)()’ [-Wformat=]
printf("%c", getch);
^
./main.c:7:2: warning: implicit declaration of function ‘ungetch’ [-Wimplicit-function-declaration]
ungetch(ch);
^
/tmp/ccGBsaa1.o: In function `main':
main.c:(.text+0xe): undefined reference to `getch'
main.c:(.text+0x16): undefined reference to `getch'
main.c:(.text+0x35): undefined reference to `ungetch'
main.c:(.text+0x3f): undefined reference to `getch'
collect2: error: ld returned 1 exit status</code></pre>
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