Issues running commands in terminal - c

Question

I have this assignment for Operating Systems, the code won't run in MAC terminal, I keep getting an issue that says, "Image". Is there any help I can get on this issue?
Here is the code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
// These two functions will run concurrently
void* print_i(void *ptr)
{
printf("I am in i\n");
}
void* print_j(void *ptr)
{
printf("I am in j\n");
}
int main()
{
pthread_t t1,t2;
int rc1 = pthread_create(&t1, NULL, print_i, NULL);
int rc2 = pthread_create(&t2, NULL, print_j, NULL);
exit(0);
}

Answer 1

The keyword void (not a pointer) means "nothing" in C. This is consistent.
As you noted, void* means "pointer to anything" in languages that support raw pointers (C and C++). This means you need to return something.
This is the reason why you get this type of warning.
If you return someting, like return 0; warnings disapear.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
// These two functions will run concurrently
void* print_i(void *ptr)
{
printf("I am in i\n");
return 0;
}
void* print_j(void *ptr)
{
printf("I am in j\n");
return 0;
}
int main()
{
pthread_t t1,t2;
int rc1 = pthread_create(&t1, NULL, print_i, NULL);
int rc2 = pthread_create(&t2, NULL, print_j, NULL);
exit(0);
}
You can learn more about it here:
https://linux.die.net/man/3/pthread_create