one program many ways

Program to check whether a number is positive, negative or is zero: (I did this while one of the teaching sessions in a few minutes to encourage student for coming out with new solutions )many programs same thing:

  1:

#include<stdio.h>

int main()
{
 int a,b;
 
 printf("enter the number");
 scanf("%d",&a);
 if(a==0)
 {
  printf(" %d number is 0",a);
 }
 else 
 {
  if(a>0)
  {
   printf(" %d number is possitive",a); 
  }
  else
  {
   printf("%d number is nagitive",a);
  }
 }
 
 return 0;
}

  2:

#include<stdio.h>

int main()
{
 int a,b;
 
 printf("enter the number");
 scanf("%d",&a);
 if(a>0)
 {
  printf(" %d number is possitive",a); 
 }
 else if(a<0)
 {
  printf("%d number is nagitive",a);
 } 
 else if(a==0)
 {
  printf(" %d number is 0",a);
 }
 
 
 return 0;
}

  3:

#include<stdio.h>

int main()
{
 int a,b;
 
 printf("enter the number");
 scanf("%d",&a);
 if(a>0)
 {
  printf(" %d number is possitive",a); 
 }
 else if(a<0)
 {
  printf("%d number is nagitive",a);
 } 
 else
 {
  printf(" %d number is 0",a);
 }
 
 
 return 0;
}

  4:

#include<stdio.h>

int main()
{
 int a,b;
 
 printf("enter the number");
 scanf("%d",&a);
 if(a>0 || a<0 )
 {
  if(a>0)
  {
   printf(" %d number is possitive",a);   
  }
  else if(a<0)
  {
   printf("%d number is nagitive",a);
  }
 } 
 else
 {
  printf(" %d number is 0",a);
 }
 
 
 return 0;
}

  5:

#include<stdio.h>

int main()
{
 int a,b;
 
 printf("enter the number");
 scanf("%d",&a);
 if(a>0 | a<0 )
 {
  if(a>0)
  {
   printf(" %d number is possitive",a);   
  }
  else if(a<0)
  {
   printf("%d number is nagitive",a);
  }
 } 
 else
 {
  printf(" %d number is 0",a);
 }
 
 
 return 0;
}

  6:

#include<stdio.h>

int main()
{
 int a,b;
 
 printf("enter the number");
 scanf("%d",&a);
 if(a!=0)
 {
  if(a>0)
  {
   printf(" %d number is possitive",a); 
  }
  else
  {
   printf("%d number is nagitive",a);
  }
  
 }
 else 
 {
  printf(" %d number is 0",a); 
 }
 
 return 0;
}