# C program to Demonstrate the Recursive function.

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;}`
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# K & R C Programs Exercise 4-13.

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); }}`
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# K & R C Programs Exercise 4-12.

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] = '';}`
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# C Program to find GCD and LCM using Recursion

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;}`
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# C program to print Fibonacci numbers using Recursion

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;   }  } } `
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