Workshop4-Program1.c

#include <stdio.h>
#include <math.h>

int getUserChoice()
{   int choice;
    printf("\n==========================MENU==============================");
	printf("\n| 1. Process primes.                              Press: 1 |");
	printf("\n| 2. Print min, max digit in an integer.          Press: 2 |");
	printf("\n| 3. Exit the program.                            Press: 3 |");
	printf("\n============================================================\n");
	printf("\nEnter Your Choice: ");
	scanf("%d%*c", &choice);
	return choice;
}

void primes() 
{    int n, i, s = 1;
     printf("\nEnter positive interger: ");
     scanf("%d", &n);
     int m = sqrt(n);
     for ( i = 2; i <= m; i++)
        if (n % i == 0)
		    s = 0;
     if (s == 1 && n == 1)
        printf("\nThe input number is not a prime!\n");
     else if (s == 0 || n <= 0) 
        printf("\nThe input number is not a prime!\n");
     else
        printf("\nThe input number is a prime!\n");
}

void digits()
{
	 int n;
	 printf("\nEnter integer: ");
	 scanf("%d", &n);
	 int max, min;
	 max = n % 10;
	 min = n % 10;
	 while( n > 0)
	 {
		int temp = n % 10;
		       n/=10;
		if ( max < temp)
		{
			 max = temp;
		}
		if ( min > temp)
		{
			 min = temp;
		}
     }
     printf("\nMinimum of digits: %d\n", min);
     printf("Maximum of digits: %d\n", max); 
}

int main()
{   int userChoice;
    do
    {   userChoice = getUserChoice();
        switch(userChoice)
		{   case 1: primes();
		            break;
		    case 2: digits();
			        break; 
		    default: printf("\nGood Bye!");
	    }
	}
	while (userChoice>0 && userChoice<3);
	return 0;
}