Learning Math in C

A menu driven program that I wrote using C language to solve the factorial, prime numbers, and odd and even numbers.

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My email address is the following jakerpomperada@gmail.com, jakerpomperada@aol.com, and jakerpomperada@yahoo.com.

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Program Listing

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

int main()

{
    printf("\n\n\t\tLearning Math in C\n");
    printf("\nCreated By Mr. Jake R. Pomperada,MAeD-IT,MIT\n\n\n");
    int choice, num, i;
    unsigned long int fact;

    while(1)
    {
        printf("1. Factorial \n");
        printf("2. Prime\n");
        printf("3. Odd\\Even\n");
        printf("4. Exit\n\n\n");
        printf("Enter your choice :  ");
        scanf("%d",&choice);
        
        switch(choice)
        {
            case 1:
                printf("Enter number:\n");
                scanf("%d", &num);
                fact = 1;
                for(i = 1; i <= num; i++)
                {
                    fact = fact*i;
                }
                printf("\n\nFactorial value of %d is = %lu\n\n\n",num,fact);
                break;
        
            case 2:
                printf("Enter number:\n");
                scanf("%d", &num);
                if(num == 1)
                printf("\n1 is neither prime nor composite\n\n");
                for(i = 2; i < num; i++)
                {
                    if(num%i == 0)
                    {
                        printf("\n%d is not a prime number\n\n", num);
                        break;
                    }
                
                }
                /*
                    Not divisible by any number other 
                    than 1 and itself
                */
                if(i == num) 
                {
                    printf("\n\n%d is a Prime number\n\n", num);
                    break;
                }
        
            case 3:
                printf("Enter number:\n");
                scanf("%d", &num);
        
                if(num%2 == 0) // 0 is considered to be an even number
                    printf("\n\n%d is an Even number\n\n",num);
                else
                    printf("\n\n%d is an Odd number\n\n",num);
                break;
        
            case 4:
                exit (0);
                
            case 5: 
				break; 
        
      			default:
        		printf("\n\nINPUT CORRECT OPTION\n\n\n");
       			break; 
        }
    }
    return 0;
}