Правильно ли выделяется память в приведенном коде - C (СИ)

#include<stdio.h>                  //printf,scanf,getchar
#include<conio.h>                  //getch,clrscr
#include<stdlib.h>                 //atoi,atof
 
struct copybook *a;
struct copybook{
    int type; //square (1) or linear (0) copybooks
    int pages; //amount of pages in the copybook
    float price; //price of the copybook
};
struct copybook *a;
/***************************************************/
int EnterN(int minimum, int maximum);
int WriteType();
int WritePages();
float WritePrice();
void PrintListByType(struct copybook *a,int n);
void SortByPages(struct copybook *a,int n);
void SortByPrice(struct copybook *a,int n);
void PrintList(struct copybook *a,int n);
void DeleteCopybook(struct copybook * a,int n);
void deleteList(struct copybook *a);
void Menu(struct copybook *a,int n);
void MakeList(int n, struct copybook *a);
/***************************************************/
int EnterN(int minimum, int maximum){
int n;
char s[10];
char *err;
    printf("BBEDUTE N>%d && <%d\n",minimum-1,maximum+1);
    do{
        printf("N=");
        gets(s);
        n=strtol(s,&err,10);
        if (n>maximum||n<minimum)
            *err=1;
        if (*err!='\0')
            printf("Error! Re-try to enter..\n");                               
    }while(*err!='\0');
    return(n);
}
 
void MakeList(int n, struct copybook *a){ 
    int i; 
 
    for (i=0;i<n;i++){
        printf("Enter tyoe of copybook [square (1) or linear (0) copybook:");
        a[i].type=WriteType();
        printf("Enter amount of pages:");
        a[i].pages=WritePages();
        printf("Enter the price:");
        a[i].price=WritePrice();
    }
  }
 
int WriteType(){
    char s[100];
    int x;
    char *err;
    do{
        gets(s);
        x=strtol(s,&err,10);
        if (x<0 || x>1)
            *err=1;
        if (*err!='\0')
            printf("Error! Re-try to enter..\n");           
    }while(*err!='\0');
    return  x;
  }
 
int WritePages(){
    char s[100];
    int x;
    do{
        scanf("%s",&s);
        x=atoi(s);
        if(x==0)
        printf("Error! Re-try to enter..\n");
    }
    while(x==0);
    return  x;
  }
 
float WritePrice(){
    char s[100];
    float x;
    do{
        scanf("%s",&s);
        x=atof(s);
        if(x==0.0)
        printf("Error! Re-try to enter..\n");
    }
    while(x==0);
    return  x;
  }
 
void PrintList(struct copybook *a,int n){
    int i;
    printf("Printed list:");
    for (i=0;i<n;i++) 
    printf("\n%-2s %-6d %-5.2f$",a[i].type,a[i].pages,a[i].price$);
  }
 
void PrintListByType(struct copybook *a,int n){
    int i;
    for (i=0;i<n;i++){
        if(a[i].type==0)
            printf("\n%-2s %-3d %-5.2f$",a[i].type,a[i].pages,a[i].price$);
    }
    for (i=0;i<n;i++){
        if(a[i].type==1)
            printf("\n%-2s %-3d %-5.2f$",a[i].type,a[i].pages,a[i].price$);
    }
  }
 
void SortByPages(struct copybook *a,int n){
int i, j;
struct copybook temp;
    for (i=0;i<n;i++){
        for (j=0;j<n;j++){
            if (a[j].pages>a[j+1].pages){
                temp=a[j+1];
                a[j+1]=a[j];
                a[j]=temp;
            }           
        }
    }
    printf ("List sorted by pages amount\n");
}
 
void SortByPrice(struct copybook *a,int n){
int i, j;
struct copybook temp;
    for (i=0;i<n;i++){
        for (j=0;j<n;j++){
            if (a[j].price>a[j+1].price){
                temp=a[j+1];
                a[j+1]=a[j];
                a[j]=temp;
            }           
        }
    }
    printf ("List sorted by price\n");
}
 
void Menu(struct copybook *a,int n){
    char c; 
    do{
        printf("\n1: Print List");
        printf("\n2: Print List By Type");
        printf("\n3: Print Sorted By Pages");
        printf("\n4: Print Sorted By Price");
        printf("\n5: ");
        printf("\n6: ");
        printf("\n Your choise is:");
        scanf("%c",&c);
        c=getchar();
    
        switch(c){
            case '1': PrintList(a,n); break;
            case '2': PrintListByType(a,n); break;
            case '3': SortByPages(a,n);PrintList(a,n); break;
            case '4': SortByPrice(a,n);PrintList(a,n); break;
            case '5':  break;
            case '6':  break;
            default: return;
        }
    }
    while(1==1);
  }
 
int main(){
    int n;
    
    system ("cls");
    n=EnterN(1,100);
    
    struct copybook *a;
    a = (struct copybook*) malloc (sizeof(struct copybook));
    
    MakeList(n, a);
    Menu(a,n);
    deleteList(a);
    getch();
    free (a);
 }