Natural Number or Not

 

#include <stdio.h>

int main()
{
  int a;
  printf("Enter 1st Number ( integer) : \n");
  scanf("%d",&a);
 
  if (a>=0){
    printf(" Number is Natural Number: \n ");
  }
  else{
    printf("Number is Not Natural Number : \n");
  }
  return 0;
}