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    <p>In this code:</p> <pre><code>char ** get_wanted_g_matrix(int pocetradek /*number of lines*/) // get wanted g matrix { char ** string; printf("Zadejte hledanou matici:\n"); int i = 0; if(( * string = (char ** )malloc(100 * sizeof(char *))) == NULL) </code></pre> <p>You dereference <code>string</code>, but it is uninitialized, so you're writing to a random location in memory. Change that <code>* string</code> to just <code>string</code>. The same applies here:</p> <pre><code>if((* string = (char **)realloc(* string, 100 * ( i - 1 ) * sizeof(char *))) == NULL) </code></pre> <p>..and to the corresponding lines in <code>get_searched_g_matrix()</code> as well.</p> <p>In this line:</p> <pre><code> if((i &gt; 1) &amp;&amp; (*string[i-1] != strlen(*string[i]))) </code></pre> <p>You're passing a <code>char</code> to <code>strlen()</code>, when you should be passing a <code>char *</code>. I suspect you mean just <code>strlen(string[i])</code>, but that line seems somewhat nonsensical. The same problem is in <code>get_searched_g_matrix()</code> as well, as well as the first three calls to <code>strlen()</code> in <code>search()</code>.</p> <p>Your <code>get_searched_g_matrix()</code> can fall off the end without returning a value - you need to consider what to return if <code>feof(stdin)</code> is not true.</p> <p>In <code>main()</code>, your call to <code>search()</code> passes <code>char</code> values, but the function expects <code>char **</code>. You probably mean:</p> <pre><code>printf("Matice nalezena %d krat.\n", search( string1, string2 )); </code></pre> <p>(The above won't be sufficient to fix your code - you also appear to have some logic problems. But it's a necessary start.)</p> <p>In future, you should compile your code with a higher level of warnings enabled, then fix the problems that the compiler identifies (if you're using gcc, compile with <code>-Wall</code>).</p>
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    1. COThanks a lot for your help
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      1. USNikolas Jíša
 

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