C program to Demonstrate the Recursive function.

Posted on March 16, 2012 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 .

/***********************************************************
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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* 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.

Posted on January 16, 2012 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 info@c-program-example.com
* 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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