Error in compile C code

Question

hi! I'm from brasil
this code is of the book "The Java Native Interface Programmer's Guide and Specification"
#include <jni.h>
#include <stdio.h>
#include "IntArray.h"
JNIEXPORT jint JNICALL
Java_IntArray_sumArray(JNIEnv *env, jobject obj, jintArray arr)
    jint *carr;
    jint i, sum = 0;
    carr = (*env)->GetIntArrayElements(env, arr, NULL);
    if (carr == NULL) {
        return 0; /* exception occurred */
    for (i=0; i<10; i++) {
        sum += carr;
(*env)->ReleaseIntArrayElements(env, arr, carr, 0);
return sum;
when I compile this code I get the following error:
C:\Dev-Cpp\IntArray.c In function `jint Java_IntArray_sumArray(JNIEnv*, _jobject*, _jintArray*)':
10 C:\Dev-Cpp\IntArray.c base operand of `->' has non-pointer type `JNIEnv_'
19 C:\Dev-Cpp\IntArray.c base operand of `->' has non-pointer type `JNIEnv_'
C:\Dev-Cpp\Makefile.win [Build Error]  [IntArray.o] Error 1
I have not changed nothing in the code. what is the problem? someone could help me?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

As a guess you are compiling it as C++. But it is written as C.