helpme ndk build executable and use not root

Hello friends this is my problem I am compiling a mini application in c with ndk estes is the code

en source .c

Code:

---

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

int main()

{
char cadena[100];
FILE *pf;

pf = fopen("texto.txt","w");
for (int a=1;a<=3;a++)
{
printf("Ingrese un texto para guardar en un archivo n");
gets(cadena);

fprintf(pf," %snn",cadena);
}
fclose(pf);

}

---

Android.mk

Code:

---

LOCAL_PATH := $(call my-dir)

# second target
include $(CLEAR_VARS)

LOCAL_MODULE := hello
LOCAL_SRC_FILES := test.c

include $(BUILD_EXECUTABLE)    # <-- Use this to build an executable.

---

but this is not a librery if not an executable the problem is as I use the executable native made in c in the apk without access root thank you for your help since now investigate but I can't find help and I'm new at this thank you for your help.
I need to use the compiled binary, but without being root user