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          <TD width="90%"><FONT face="Verdana, Arial, Helvetica" size=4><B>C 
            函數實現</B></FONT></TD>
          <TD align=right width=200><FONT face="Verdana, Arial, Helvetica" 
            size=1><NOBR>第 10 頁（共16 
      頁）</NOBR></FONT></TD></TR></TBODY></TABLE><BR><BR></P><FONT 
      face="Verdana, Arial, Helvetica" size=2>
      <P>以下是 Sample1.c，它是用 C 編寫的實現：</P><PRE><CODE style="FONT-SIZE: 12px; FONT-FAMILY: Courier New, Courier, monospace">
 1. #include "Sample1.h"
 2. #include &lt;string.h&gt;
 3. 
 4. JNIEXPORT jint JNICALL Java_Sample1_intMethod
 5.   (JNIEnv *env, jobject obj, jint num) {
 6.    return num * num;
 7. }
 8. 
 9. JNIEXPORT jboolean JNICALL Java_Sample1_booleanMethod
10.   (JNIEnv *env, jobject obj, jboolean boolean) {
11.   return !boolean;
12. }
13.
14. JNIEXPORT jstring JNICALL Java_Sample1_stringMethod
15.   (JNIEnv *env, jobject obj, jstring string) {
16.     const char *str = (*env)-&gt;GetStringUTFChars(env, string, 0);
17.     char cap[128];
18.     strcpy(cap, str);
19.     (*env)-&gt;ReleaseStringUTFChars(env, string, str);
20.     return (*env)-&gt;NewStringUTF(env, strupr(cap));
21. }
22. 
23. JNIEXPORT jint JNICALL Java_Sample1_intArrayMethod
24.   (JNIEnv *env, jobject obj, jintArray array) {
25.     int i, sum = 0;
26.     jsize len = (*env)-&gt;GetArrayLength(env, array);
27.     jint *body = (*env)-&gt;GetIntArrayElements(env, array, 0);
28.     for (i=0; i&lt;len; i++)
29.     {	sum += body[i];
30.     }
31.     (*env)-&gt;ReleaseIntArrayElements(env, array, body, 0);
32.     return sum;
33. }
34. 
35. void main(){}
</CODE>
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