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gcc -O0 -g3 -Wall -c -fmessage-length=0 -oHelloWorld.o ..\HelloWorld.c
gcc -otest.exe HelloWorld.o
d:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../libmingw32.a(main.o):main.c:(.text+0x104): undefined reference to `WinMain@16'
collect2: ld returned 1 exit status
Build error occurred, build is stopped
Time consumed: 422  ms. 

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C/C++ code:
#include "HelloWorld.h"
void JNICALL Java_HelloWorld_displayHelloWorld (JNIEnv* env, jobject obj){
printf("hi ,this is from c");
}



HelloWorld.h
C/C++ code:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class HelloWorld */

#ifndef _Included_HelloWorld
#define _Included_HelloWorld
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: HelloWorld
* Method: displayHelloWorld
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld
(JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

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