creating a second process in C - c

Question

Im new in C programming and i have to do this:
Write a program that creates a second process, and then in both processes outputs the process ID and the owners user ID.
I don't know if thats right and how to continue from here. Here is what i have:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
int main(void) {
int ChildPID;
printf("This is the parent process number %d\n",getpid());
if ((ChildPID = fork()) == -1) {
perror("Could not fork");
exit(EXIT_FAILURE);
}
if (ChildPID == 0) {
//----In the child process
printf("This is the child process, number %d parent number %d\n", getpid(), getppid());
}
return(EXIT_SUCCESS);
}

Answer 1

The piece of code given below gives your solution. Here you can clearly identify parent code and child process code. Both are printing their corresponding pids.
void ExecuteChild(void);
void ExecuteParent(void);
int main(void)
{
pid_t pid;
pid = fork();
if (pid == 0)
ExecuteChild();
else
ExecuteParent();
}
void ExecuteChild(void)
{
int i;
for (i = 1; i <= 200; i++)
printf("CHILD[%d]: UserID[%d] printing - %d\n", getpid(),getuid(),i);
printf(" ------------- Child Exiting -------------\n");
}
void ExecuteParent(void)
{
int i;
for (i = 1; i <= 200; i++)
printf("PARENT[%d]: UserID[%d] printing - %d\n", getpid(),getuid(),i);
printf(" ------------- Parent Exiting -------------\n");
}