Shmget is returning a value of -1 - c

Question

When I run shmget in the following code it is returning a value of -1 and im not sure why that is the case. Everything else seems to be running fine. The code is just supposed to take in a few digits from the command line and then create shared memory for them. The digits will range from 0 to 9.
#include <sys/ipc.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/shm.h>
#include <stdlib.h>
#include <sys/types.h>
int main(int argc, char *argv[])
{
int numArgc =(int)argc-1; //number of vauled arguments passed
int arrayId[numArgc];
pid_t pid;
int arrSpace[numArgc]; //array to store atoi of values
int status;
int *memory; //pointer to shared memory
int memoryId; //check for smhget
int childPID;
int childId;
if(argc > 8 || argc < 2) //check number of cmd line arg
{
printf("The number of arguments must be between 1 and 7");
return(0);
}
else
{
for(int i=1; i<numArgc+1; i++) //store args as integers
{
arrSpace[i]=atoi((argv[i]));
printf("%d\n", arrSpace[i]);
}
}
memoryId=shmget(IPC_PRIVATE, try, IPC_CREAT | 07546); //create shared
printf("%d \n", memoryId);
if(memoryId<0)
{
printf("There was an error with ID.\n");
return (0);
}
printf("%s%d", "Size of shared Memory of parent is \n ", numArgc);
memory=(int*)shmat(memoryId, NULL, 0); // attaches shared memory
if((long)memory == -1)
{
printf("There was an error running shmat .\n");
return (0);
}
printf("Share memory is now: \n");
for(int i=0; i<numArgc; i++)
{
memory[i]=arrSpace[i];
}
printMemory(memory, numArgc);
printf("Beginning fork process");
for(childId; childId <= numArgc; childId++)
{
pid = fork(); //creates new process
if(pid < 0)
{
printf("There was an error during fork process");
return (0);
}
else if(pid == 0)
{
ChildProcess(memory, numArgc, childId);
exit(0);
}
}
ParentProcess(memory, childPID, numArgc, memoryId, status);
return (0);
}

Answer 1

shmget returns -1 because try variable is undefined and the permission 07546 is invalid.Please pass appropriate permission for the memory segment.
#define MEMORY_SIZE 20 //size of memory segment
memoryId=shmget(IPC_PRIVATE, MEMORY_SIZE , IPC_CREAT | 0666); //create shared
printf("%d \n", memoryId);