Android FAQ 45: undefined reference to & amp; #39; srand & amp; #39;

Android FAQ 45: undefined reference to & #39; srand & #39;

Ndk 10b ~ 10e has no problem in compiling and using the C random number functions srand and rand,
However, when the program is running, an error similar to the following is reported:

 error: undefined reference to 'srand' error: undefined reference to 'rand'

This leaves me puzzled.
I made the following attempts:
1. Some netizens said that my ndk version is too low to use a higher version.
I changed the original 10b to 10e, but the result still failed.
2. Some netizens say they want to replace the cross compiler with a later version. I have updated the version and the result is still not correct.
3. Some netizens say they should not use 64-bit ndk. They should use 32-bit ndk. I downloaded a 32-bit 10e, but I still cannot.

When I was about to give up the crash, foreign netizens mentioned stdlib. h, as if I had seen this header file yesterday.
I tried to add this header file, compile and run it, and pass it!

This may be the adjustment of the bionic library, which is somewhat different from the original C standard library. However, since it's okay, it's worth noting!

#include shooter.h#include 
  
   #include 
   
    void bubble_sort(int *array,int n) {    int i,j,tmp;    for(i=0;i
    
     i;j--) {            if(array[j-1]>array[j]) {                tmp = array[j-1];                array[j-1]=array[j];                array[j]=tmp;            }        }    }}int A(int a) {    int n = 10;    int i;    int array[n];    srand(time(NULL));    for(i=0;i