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;

}