Occurrence of symbols

What at me it is not correct with occurrence of symbols?

struct my{

char fio[40];

int numer;

char date1[40];

char date2[40];

int mark1;

int mark2;

};


int n,j; 

struct my list1[10]= { {"Vasya",433},{"zhenya",34},{"bobr",45},{"sasha",342},{"belka",4322},{"sachek",3244},{"bredly",324},{"alex",244},{"kostya",3422},{"knedlik",90}};

struct my list2[10]={ {"masha",433},{"tanya",34},{"ulya",45},{"katya",342},{"polina",4322},{"vika",3244},{"sveta",232},{"olga",23211},{"margarita",434}};

void enter(struct my *p)

{

	int a;

printf(" skol`ko?!\n");

scanf("%i",&n);

for(a=0;a<n;a++)

{

	printf(" the first list\n");

	printf("enter the date:\n");

	scanf("%s",&p[a].date1);

	printf("enter the mark:\n");

	scanf("%i",&p[a].mark1);

	printf("\n");

	printf("vvedite list2:\n");

	printf("enter the date:\n");

	scanf("%s",&p[a].date2);

	printf("enter the mark:\n");

	scanf("%i",&p[a].mark2);

}

printf("SPISOK 1:\n");

printf("# fio        nmber      date         mark\n");

printf("___________________________________________________\n");

for(a=0;a<n;a++){

		printf("%i %6s %8i %10s %12i",a,list1[a].fio,list1[a].numer,p[a].date1,p[a].mark1);

		printf("\n");}

	printf("\nSPISOK 2:\n");

printf("# fio        nmber      date         mark\n");

printf("___________________________________________________\n");

	for(a=0;a<n;a++){

printf("%i %6s  %8i %10s %12i\n",a,list2[a].fio,list2[a].numer,p[a].date2,p[a].mark2);


	}	

	//[SIZE="6"]Occurrence of symbols[/SIZE]:


	for(a=0;a<n;a++){

char arr[256];

	int i;

	for(i=0;i<256;i++)

		arr[i]=0;

		arr[list1[a].mark1]++;

	for(i=0;i<256;i++)

		if(arr[i]) printf("\n symbol %c vstrech %d raza",i,arr[i]); 

			} 


}

void main(){

	struct my *p;

	p=(struct my *)malloc(30*sizeof(my));

	if(p==NULL) exit(1);

	enter(p);	

	getch();

	free(p);

}