Question

hi I m trying to convert my java code to c code for better speed ,

and I want to generate a random number in c code using jni(android)

in java code,

public  int getRandomNumberFor()
    {
        Random random ;
        random = new Random();
        return random.nextInt(0xFF);
    }

I don’t know what code work for c

I tried finding example, but unfortunately I don’t get it. can any one help me in this.?

Answer 1

Change your code as using C Programming in NDK :

#include <stdio.h>
#include <stdlib.h>

JNIEXPORT jint JNICALL Java_com_imrantestndk_androiddemo_NativeLib_Randomnum
  (JNIEnv * env, jobject this){
    int n;
     n = rand()%100 + 1;

    return n;
}

Or

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
JNIEXPORT jint JNICALL Java_com_imrantestndk_androiddemo_NativeLib_Randomnum
  (JNIEnv * env, jobject this){
int random;
randomize();
random = random(100);
return random;
}