I'm trying to run my first "process" program,but get the following error :

./fork.c: line 4: syntax error near unexpected token `('
./fork.c: line 4: `int main()'

I'm pretty sure that the code is correct

 #include <sys/types.h>
 #include <stdio.h>
 int main()
 {
 pid_t pid;
printf("Hello fork()\n");
 switch(pid=fork())
 {
 case -1: printf("Error by fork().....\n"); exit(0);
case  0: printf("I'm the child process \n"); break;
default: printf("I'm the dad \n"); break;
}
  exit(0);
}

I'm trying to run my first "process" program, but I get the following error :

./fork.c: line 4: syntax error near unexpected token `('
./fork.c: line 4: `int main()'

I'm pretty sure that the code is correct:

 #include <sys/types.h>
 #include <stdio.h>
 int main() {
     pid_t pid;
     printf("Hello fork()\n");
     switch(pid=fork())  {
         case -1: printf("Error by fork().....\n"); exit(0);
         case 0: printf("I'm the child process \n"); break;
         default: printf("I'm the dad \n"); break;
     }
  exit(0);
}

What is wrong?