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#include <stdio.h>
 
int fibo(int n) //recursive function, returns nth element of series
{
if(n==1)       //1st term
return 0;
else if(n==2)  //2nd term
return 1;
 
return (fibo(n-1)+fibo(n-2));
}
 
int fact(int n) //recursive function, returning fact
{ 
int f;
 
if(n>0)
{
f=n*fact(n-1); 
return f;
}
else
return 1;
}
 
int main()
{
 
int n,i; //to avoid redeclaration and its consequent error
int ch=6; //ch is choice 
 
int digit, num, rev=0, A=0; //for palindrome & angstrom checking
 
do
{
printf("\n\n MENU ");
printf("\n 1. Fibonacci Series ");
printf("\n 2. Factorial of number ");
printf("\n 3. Multiplication table ");
printf("\n 4. Check whether number is Palindrome ");
printf("\n 5. Check whether number is Angstrom ");
printf("\n 6. EXIT ");
printf("\n Enter your choice: ");
scanf("%d",&ch); printf("\n");
 
switch(ch)
{
case 1: 
 
printf(" Enter the no of elements of fibonacci series to show:");
scanf("%d",&n);
 
printf("\n Fibonacci: \n");
for(i=1; i<=n; i++)
printf(" %d ", fibo(i) );
 
printf("\n");
break;
 
case 2:
 
printf(" Enter the number to find factorial of: ");
scanf("%d", &n);
 
printf("\n Factorial is: %d", fact(n));
break;
 
case 3:
 
printf(" Enter the number of whose multiplication table ");
printf("is to be made (till 12) :");

scanf("%d",&n);
 
printf(" Table: ");
for(i=1; i<=12; i++)
printf("\n %dx%d=%d ",n,i,(n*i));
 
break;
 
case 4: 
 
printf(" Enter number to check whether palindrome: ");
scanf("%d",&n);
 
num=n;
 
do
{
digit=num%10;
rev=(rev*10)+digit;
num/=10;
}
while(num>0);
 
if(rev==n)
printf("\n Number is Palindrome. ");
else
printf("\n Number is not Palindrome. ");
 
break;
 
case 5:
 
printf(" Enter number to check whether Angstrom: ");
scanf("%d",&n);
 
num=n;
 
do 
{
digit=num%10;
A+=digit*digit*digit;
num/=10;
}
while(num>0);
 
if(A==n)
printf("\n Number is Angstrom. ");
else
printf("\n Number is not Angstrom. ");
 
break;
 
 
case 6:
printf(" Exiting... ");
break;
 
default: 
printf("INVALID CHOICE");
}
 
}
while(ch!=6);
 
return 0;
}