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C Program : Factorial Program using Recursion

#include<stdio.h>

long factorial(int n) {  
  

  if (n == 0)  
    return 1;  
  else  
    return(n * factorial(n-1));  

    }  

   

void main(){  
 

     int number;  

     long fact;  

     printf("Enter a number: ");  
     scanf("%d", &number);   
   
     fact = factorial(number);  
     printf("Factorial of %d is %ld\n", number, fact);  
 

     return 0;  
}  

Output:

Enter a number: 6
Factorial of 5 is: 720

C Program : Factorial Program using loop

#include<stdio.h>
int main(){

    
           int i,fact=1,number;    
           printf("Enter a number: ");    
           scanf("%d",&number); 

   
           for(i=1;i<=number;i++){    
                fact=fact*i;    
                }    
  

          printf("Factorial of %d is: %d",number,fact);    

          return 0;  
         }   

Output:

Enter a number: 5
Factorial of 5 is: 120

C Program : Palindrome

Let's see the palindrome program in C. In this c program, we will get an input from the user and check whether number is palindrome or not.

#include  
int main(){    

           int n,r,sum=0,temp;    
           printf("enter the number=");    
           scanf("%d",&n);    
           temp=n;  

  
           while(n>0){    
                   

                  r=n%10;    
                  sum=(sum*10)+r;    
                  n=n/10;    
                 }    

          if(temp==sum)    
          printf("palindrome number ");    
 

          else    
          printf("not palindrome");   

          return 0;  
       }   

Output:

enter the number=151
palindrome  number

enter the number=5621
not palindrome  number

C Program : Prime Number

#include  
int main(){   

 
       int n,i,m=0,flag=0;    
       printf("Enter the number to check prime:");    
       scanf("%d",&n);    
       m=n/2;

    
       for(i=2;i<=m;i++){

    
               if(n%i==0){   

                    printf("Number is not prime");

                    flag=1;    

                    break;    
                     }    
            }   

 
     if(flag==0)    
     printf("Number is prime");     

     return 0;  
    }

Output:

Enter the number to check prime:56
Number is not prime

Enter the number to check prime:23
Number is prime

C Program : Fibonacci Series using Recursion

#include    
void printFibonacci(int n){ 

   
    static int n1=0,n2=1,n3;    
    if(n>0){ 

   
         n3 = n1 + n2;    
         n1 = n2;    
         n2 = n3;    
         printf("%d ",n3);    
         printFibonacci(n-1);    
    }    
}   

 
int main(){    

    int n;    
    printf("Enter the number of elements: ");    
    scanf("%d",&n);    
    printf("Fibonacci Series: ");    
    printf("%d %d ",0,1);    
    printFibonacci(n-2);//n-2 because 2 numbers are already printed   

 
  return 0;  
 }    

Output:

Enter the number of elements:15
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 

C Program : Fibonacci Series without Recursion

#include  

#include  

void main(){    
            int n1=0,n2=1,n3,i,number; 

            clrscr();  

 
            printf("Enter the number of elements:");    
            scanf("%d",&number);    

            printf("\n%d %d",n1,n2);//printing 0 and 1

            for(i=2; i<number; ++i){

                                   
                        n3=n1+n2;    
                        printf(" %d",n3);    
                        n1=n2;    
                        n2=n3;    
                      }  
                        

                        getch();  

               }    

Output:

Enter the number of elements:15
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 

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