C Program to find Palindrome using recursion

C Program to find Palindrome using recursion

 

Program:-

#include <stdio.h>

#include<conio.h>

#include <math.h>

int reverse(int num);

int isPalindrome(int num); 

int main()

{

int num;     

printf("Enter any number: ");

scanf("%d", &num);

if(isPalindrome(num) == 1)

{

printf("%d is palindrome number.\n", num);

}

Else

{

printf("%d is NOT palindrome number.\n", num);

}

return 0;

}

int isPalindrome(int num)

{

if(num == reverse(num))

{

return 1;

}     

 return 0;

}

int reverse(int num)

{

int digit;     

if(num==0)

return 0;

digit = (int)log10(num)     

return ((num%10 * pow(10, digit)) + reverse(num/10));

}

Output:

Enter any number: 1221
1221 is palindrome number.

 

C Program to find Factorial using recursion

C Program to find Factorial using recursion

Program 

#include <stdio.h> 

#include<conio.h>

long int factorial(int n)

{  

if(n==1)    return 1;

return n*factorial(n-1);

}

int main()

{

int num;

long int fact=0;     

printf("Enter an integer number: ");

scanf("%d",&num);     

fact=factorial(num);

printf("Factorial of %d is = %ld",num,fact);

printf("\n");  

return 0;

}

 

Output:-

Enter an integer number: 5

Factorial of 5 is = 120

C Program for Swapping using call by value method

C Program for Swapping using call by value method

Program:-        

#include <stdio.h>

#include<conio.h>

void swap(int, int);

int main()

{

int x, y;

printf("Enter the value of x and y\n");

scanf("%d %d", &x, &y);  

printf("Before Swapping x = %d y = %d\n", x, y);

swap(x, y);    

printf("After Swapping  x = %d  y = %d\n", x, y);

return 0;

}

void swap(int a,  int b)

{

int temp;   

temp = b;

b = a;

a = temp;

printf("Values of a and b is %d  %d\n", a, b);

}

Output:-

Enter the value of x and y : 4  6

Before Swapping x = 4 y =6

After Swapping  x = 6 y = 4

C Program to find sum of N numbers

 C Program to find sum of N numbers

Program:-

#include<stdio.h>

#include<conio.h>

int sum(int);

int main()

{

int num,s;

printf("enter value of n:");

scanf("%d",&num);

s = sum(num);

printf("sum of %d numbers = %d\n", num, s);

}

int sum(int num)

{

int i,sum=0;

for(i=0;i<=num;i++)

{

sum = sum + i;

 }

return sum;

}

Output:

enter value of n: 5

sum of %d numbers =15