Ошибки компилятора Syntax error:missing ')' before 'constant' - C (СИ)

#include <conio.h>
#include <stdio.h>
#include <string.h>
 
#define size 5
 
typedef struct Client 
{
    int Pnum;
    char ClientName[15];
    char ClientAdress[20];
    int Baccount;
}Clients;
 
void initStructClient(Clients * ptrc)
{
    printf("Enter Clients Phone Number:");
    scanf("%d",&(ptrc->Pnum));
    printf("Enter Clients Name:");
    gets(ptrc->ClientName);
    printf("Enter Clients Adress:");
    gets(ptrc->ClientAdress);
    printf("Enter Clients Bank Account");
    scanf("%d",&(ptrc->Baccount));
}
 
void initClients(Clients arrClients[],int size)
{
    int i;
    for(i=0;i<size;i++)
        initStructClient(&arrClients[i]);
}
void main()
{
    Clients arrClients[size];
    initClients(arrClients,size);
}