recursion in c

C program to Demonstrate the Recursive function.

Posted on by Sandeepa Nadahalli
Write a C program to demonstrate the recursive function.
Recursion  is the programming technique that a process invoking itself again and again. In this program, We reverse the given number and checks it is a palindrome or not. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<conio.h>

int main(){
 clrscr();
 int num,num1,rev;
 printf("nEnter a number :n");
 scanf("%d",&num);
 num1=num;
 //call recursive function
 rev=reverse(num);

 printf("nAfter reverse the number is :n%d",rev);
 if(num1==rev){
  printf("nnNumber  %d is Palindromen",num1);
 }else
 {
  printf("nnNumber  %d is NOT a Palindromen",num1);
 }

 return 0;
}
int sum=0,r;
reverse(int num){
 if(num){
  r=num%10;
  sum=sum*10+r;
  reverse(num/10);
 }
 else
  return sum;
 return sum;
}

Read more Similar C Programs
Learn C Programming
Recursion
Number System

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link
(c) www.c-program-example.com

K & R C Programs Exercise 4-13.

Posted on by Sandeepa Nadahalli
K and R C, Solution to Exercise 4-13:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write a C Program to reverse the string using the recursive methods.
In this program reverse determines the length of the string and then calls the reverser, which reverses the string s in place. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/
#include<stdio.h>
/* reverse: reverse the string s in place */
void reverse(char s[])
{

 void reverser(char s[], int i, int len);
 reverser(s,0,strlen(s));
}

/* reverser: reverse string s in place recursive */
void reverser(char s[], int i, int len)
{
 int c, j;
 j = len - (i + 1);
 if(i < j)
 {
  c = s[i];
  s[i] = s[j];
  s[j] = c;
  reverser(s, ++i, len);
 }
}

Read more Similar C Programs
C Basic
C Strings
K and R C Programs Exercise

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link
(c) www.c-program-example.com

K & R C Programs Exercise 4-12.

Posted on by Sandeepa Nadahalli
K and R C, Solution to Exercise 4-12:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write a C program to convert an integer into a string by calling a recursive routine.Recursive routine is the programming technique that a routine invoking itself again and again. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<math.h>
void itoa(int n, char s[]);
int main(void) {
 char buffer[20];

 //for testing!
 printf("INT_MIN: %dn", INT_MIN);
 itoa(INT_MIN, buffer);
 printf("Buffer : %sn", buffer);

 return 0;
}
/* itoa: convert n to characters in s; recursive */
void itoa(int n, char s[])
{
 static int i;
 if(n / 10)
  itoa(n /10, s);
 else{
  i = 0;
  if(n < 0)
   s[i++] = '-';
 }
 s[i++] = abs(n) %10 + '0';
 s[i] = '';
}

Read more Similar C Programs
C Basic
C Strings
K and R C Programs Exercise

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link
(c) www.c-program-example.com

C Program to find GCD and LCM using Recursion

Posted on by Sandeepa Nadahalli
C Program to find the GCD and LCM. In this program we used the Recursion method. Recursion is the programming technique that a process invoking itself again and again. Here find_gcd() and find_(lcm) are the recursive methods. for example LCM and GCD of 8,12 is 24 and 4 Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
*  
*                      Happy Coding
***********************************************************/

/* 
* http://www.c-program-example.com/2011/10/c-program-to-find-gcd-and-lcm-using.html
*/ 

/* Find this on GitHub: 
*  https://github.com/snadahalli/cprograms/blob/master/gcd_lcm_rec.c
*/

#include "stdio.h"
int find_gcd(int,int);
int find_lcm(int,int);
int main(){
 int num1,num2,gcd,lcm;
 printf("nEnter two numbers:n ");
 scanf("%d %d",&num1,&num2);
 gcd=find_gcd(num1,num2);
 
 printf("nnGCD of %d and %d is: %dnn",num1,num2,gcd);
 
 if(num1>num2)
  lcm = find_lcm(num1,num2);
 else
  lcm = find_lcm(num2,num1);
 
 printf("nnLCM of %d and %d is: %dnn",num1,num2,lcm);
 return 0;
}
 
int find_gcd(int n1,int n2){
 while(n1!=n2){
  if(n1>n2)
   return find_gcd(n1-n2,n2);
  else
   return find_gcd(n1,n2-n1);
 }
 return n1;
}

int find_lcm(int n1,int n2){
 
 static int temp = 1;
 
 if(temp % n2 == 0 && temp % n1 == 0)
  return temp;
 temp++;
 find_lcm(n1,n2);
 
 return temp;
}
Read more Similar C Programs
Learn C Programming
Recursion
Number System

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

(c) www.c-program-example.com

C program to print Fibonacci numbers using Recursion

Posted on by Sandeepa Nadahalli
C Program to print Fibonacci numbers. In this program we used the Recursion method. Recursion is the programming technique that a process invoking itself again and again. Fibonacci numbers are sequence of numbers starts from 0 and 1 , continue by adding previous number. 0,1,1,2,3,5,8,13,…….. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h> 
#include<conio.h> 
int fib(int); 
int f=1,fib1=0,fib2=0,i=0,j; 
void main() 
{ 
 int num; 
 clrscr(); 
 printf(" How many Fibonacci numbers do you want?n"); 
 scanf("%d",&num); 
 printf("nFibonacci Numbers are:n");
 f=0; 
 printf("n%dn",f); 
 f=1; 
 printf("n%dn",f); 
 for(j=0;j<num-2;j++) 
 { 
  f=fib(num); 
  printf("n%dn",f); 
 } 
 getch(); 
} 
int fib(int n) 
{ 

 while(i<n) 
 { 
  if(i<=n) 
  { 
   i++; 
   fib1=fib2; 
   fib2=f; 
   f=fib2+fib1; 
   fib(1); 
   return f; 
  } 
 } 

} 


Read more Similar C Programs
Learn C Programming
Recursion
Number System

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

(c) www.c-program-example.com