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    <p>Thank you very much Blindy for your hints. I tried to implement your hints. Now the program doesn't throw errors but the problem is that i can't check if the operation is done correctly with the programm-environment i've to work with. Do you think the code is correct as it is shown below? Also the time it takes is quite less: 11ms. Do I calc this right?</p> <p>Neil Butterworth,... well your're probably right, but I had to start somehow... and I tried my best to do so. Vinko Vrsalovic,... well you're not right ;) I did it step by step but I thought that its better to show you the whole program and all errors at one time. </p> <pre><code>#include &lt;string.h&gt; #include &lt;jni.h&gt; #include &lt;time.h&gt; #include &lt;stdlib.h&gt; long start, finish; static int ARRAY_LENGTH = 500; static int WORD_LENGTH = 4; static int LOOPS = 10; char *values[1000]; static long getTime(void){ struct timeval now; gettimeofday(&amp;now, NULL); return (long)(now.tv_sec*1000 + now.tv_usec/1000); } void sortStringArray(void){ int i, j; for(i = 0; i &lt; ARRAY_LENGTH; i++){ for(j = 0; j &lt; ARRAY_LENGTH-1; j++){ if(strcmp(values[j], values[j+1]) &gt; 0) { char *holder = values[j+1]; values[j+1] = values[j]; values[j] = holder; } } } } char* generateRandomChar(char *aC){ int length = strlen(aC); char randStr[WORD_LENGTH]; int m; for(m = 0; m &lt;WORD_LENGTH; m++){ int randNr = rand()%length; randStr[m] = aC[randNr]; } return strdup(randStr); } void fillStringArray(void) { char *allowedChars = "abcdefghijklmnopqrstuvwxyz"; int k; for(k = 0; k &lt; ARRAY_LENGTH; k++){ char *randStr = generateRandomChar(allowedChars); values[k] = randStr; } } jlong Java_com_example_hellojni_HelloJni_processStringSort( JNIEnv* env, jobject thiz) { start = getTime(); int i; for(i = 0; i &lt; LOOPS; i++){ fillStringArray(); sortStringArray(); } finish = getTime(); return (finish - start); } </code></pre>
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    1. POSorting strings with C
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    1. COYou do it step by step and TEST it until it is doing what it should do... having a complete and incorrect program shows you didn't do that. You just shouldn't move on to the next function or piece of code until the other one is tested and shown correct.
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    2. COYou need to add a loop over "values" to free the memory you have allocated with the strdup, for instance as a separate function to be called after sortStringArray. Otherwise you create memory leaks.
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    3. COAlternatively to using strdup you could replace "char randStr[WORD_LENGTH];" by "char* randStr=(char*)malloc(WORD_LENGTH+1);" and add randStr[WORD_LENGTH]=0 before the return. It saves to copy the string.
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