C Code 18 _ To Find odd or even number, Prime or Not, Fibbonacci Series and Sum of Digits of a number (4 in 1)

C Code 18 _ To Find odd or even number, Prime or Not, Fibbonacci Series and Sum of Digits of a number (4 in 1) 

Program:

#include<stdio.h>

int main()

{

                int ch,n,i,p=0,a=0,b=1,c=0,sum=0,t,ans;

                printf("\n* * * * * * Program Menu * * * * * * *");

                printf("\n\n1 - Find odd or even");

                printf("\n\n2 - Find prime or not");

                printf("\n\n3 - Generate fibbonaci series");

                printf("\n\n4 - Find sum of digits");

                printf("\n\nEnter a choice : ");

                scanf("%d",&ch);

                switch(ch)

                {

                                case 1:

                                                printf("\n\n* * * * * * Odd or Even * * * * * *");

                                                printf("\n\nEnter a number : ");

                                                scanf("%d",&n);

                                                if(n<0)

                                                {

                                                                printf("%d is a negative number",n);

                                                }

                                                else if(n%2==0)

                                                {

                                                                printf("\n\n%d is a Even Number",n);

                                                }

                                                else

                                                {

                                                                printf("\n\n%d is a Odd Number",n);

                                                }

                                                break;

                                               

                                case 2:

                                                printf("\n\n* * * * * * Prime or Not * * * * * *");

                                                printf("\n\nEnter a number : ");

                                                scanf("%d",&n);

                                                if(n==1)

                                                {

                                                                p=1;

                                                }

                                                for(i=2;i<n;i++)

                                                {

                                                                if(n%i==0)

                                                                {

                                                                                p=1;

                                                                                break;

                                                                }

                                                }

            if(p==1)

            {

                printf("\n\n%d is Not a Prime Number",n);

                                                }

                                                else

                                                {

                                                                printf("\n\n%d is a Prime Number",n);

                                                }

                                                break;

                                               

                                case 3:

                                                printf("\n\n* * * * * * Fibbonacci Series * * * * * *");

                                                printf("\n\nEnter a number : ");

                                                scanf("%d",&n);

                                                printf("\n\nFibbonaci Series : ");

                                                for(i=1;i<=n;i++)

                                                {

                                                                printf("%d ",c);

                                                                c=a+b;

                                                                a=b;

                                                                b=c;

                                                }

                                                break;

                                               

                                case 4:

                                                printf("\n\n* * * * * * Sum of Digits * * * * * *");

                                                printf("\n\nEnter a number : ");

                                                scanf("%d",&n);

                                                ans=n;

                                                while(n>0)

                                                {

                                                                t=n%10;

                                                                sum=sum+t;

                                                                n=n/10;

                                                }

                                                printf("\n\nThe sum of digit of %d is %d",ans,sum);

                                                break;

                                               

                                default:

                                                printf("\n\nEnter choice only from 1 t0 4");

                }

                getch();

                return 0;

}

Output:

Thank You ...