C program to check odd or even using recursion

In this tutorial, we will discuss a concept of the C program to check odd or even from the given number using recursion

In this article, we are going to learn how to check odd and even numbers using recursion in the C programming language

Program 1

// C program to check odd or even using recursion
#include <stdio.h>
//recursive function to check if a number is even
int isEven(int num){
    if(num==0)
     return 1;
     //base case: 0 is even
     else if (num==1)
     return 0;
     //base case: 1 is odd
     else return isEven(num-2);
     //recursive case: reduce the number by 2 
}
int main() {
    int num;
    //input a number from the user
    printf("Enter a number: ");
   scanf("%d",&num);
  
   
   //check if the number is even or odd using recursion
   if (isEven(num))
    printf("%d is even\n",num);
    else
     printf("%d is odd\n",num);
    return 0;
}

When the above code is executed, it produces the following results

Case 1

Enter a number: 53
53 is odd

Case 2

Enter a number: 100
100 is even

Explanation

The isEven() function reduces the number by 2 in each recursive call
The base case is when the number reaches 0 or 1. If it reaches 0, the number is even. if it reaches 1, the number is odd
The recursion continues until it matches one of the base case

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