#include <stdio.h>
#include <stdlib.h>

#define SIZE 100

char menu(void);
void printNums(void);
int isPrime(int num);
void printPrime(void);
int isEven(int num);
void printEven(void);
int isOdd(int num);
void printOdd(void);

int main(void)
{
	char ch;
	char loop = 'y';

	printf("First Hundred Numbers are given below:\n");
	printNums();


	while(loop == 'y' || loop == 'Y'){

		fflush(stdin);
		ch = menu();

		if(ch == 'p' || ch == 'P')
			printPrime();
		else if(ch == 'e' || ch == 'E')
			printEven();
		else if(ch == 'o' || ch == 'O')
			printOdd();
		else
			printf("\nWRONG CHOICE!\n");



		printf("\n\nContinue? (y or n): ");
		scanf(" %c", &loop);

		system("cls");

	}

	printf("\n\n");

	return 0;
}


void printNums(void)
{
	int nums[SIZE];
	int i;

	for(i=0; i<SIZE; i++){
		if((i%10) == 0){
			printf("\n");
		}
		nums[i] = i+1;
		printf("%5d", nums[i]);
	}

}


char menu(void)
{
	char ch;

	printf("\n\n\n\t\tOPTIONS\n");
	printf("\t\t________\n\n");
	printf("1) To display prime numbers press 'P'.");
	printf("\n2) To display even numbers press 'E'.");
	printf("\n3) To display odd numbers press 'O'.\n");
	scanf("%c", &ch);

	return ch;

}

int isEven(int num)
{
	if((num % 2) == 0)
		return 1;
	else
		return 0;
}

int isOdd(int num)
{
	if((num % 2) != 0)
		return 1;
	else
		return 0;
}

int isPrime(int num)
{
	int count=0;
	int i;

	for(i=1; i<=num; i++){
		if((num % i) == 0)
			count++;
	}

	if(count == 2)
		return 1;
	else
		return 0;

}

void printPrime(void)
{
	int i;
	int nums[SIZE];
	char ch = '*';
	printf("\n\n\t\tPrime numbers are given below: \n\n");
	for(i=0; i<SIZE; i++){
		if((i%10) == 0){
			printf("\n");
		}
		nums[i] = i+1;
		if(isPrime(nums[i]))
			printf("%5d", nums[i]);
		else
			printf("%5c", ch );
	}
}

void printEven(void)
{
	int i;
	int nums[SIZE];
	char ch = '*';

	printf("\n\n\t\tEven numbers are given below: \n\n");

	for(i=0; i<SIZE; i++){
		if((i%10) == 0){
			printf("\n");
		}
		nums[i] = i+1;
		if(isEven(nums[i]))
			printf("%5d", nums[i]);
		else
			printf("%5c", ch );
	}
}

void printOdd(void)
{
	int i;
	int nums[SIZE];
	char ch = '*';

	printf("\n\n\t\tEven numbers are given below: \n\n");

	for(i=0; i<SIZE; i++){
		if((i%10) == 0){
			printf("\n");
		}
		nums[i] = i+1;
		if(isOdd(nums[i]))
			printf("%5d", nums[i]);
		else
			printf("%5c", ch );
	}
}