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In this example we need to find the value of X in such a way that we should get “Hello World” as output

C programming puzzle

#include<stdio.h>
void main()
{
if(X)
  {
   printf("Hello");
  }
else
  {
   printf("World");
  }
}

What would be value of X in order to get Hello World as output ?

Different ways to solve c programming puzzle

Way 1 : Use of printf statement

#include<stdio.h>
void main()
{
if(printf("Hello")-5)
  {
   printf("Hello");
  }
else
  {
   printf("World");
  }
}

Explanation of the Program :

1. Printf Returns Number of Characters Printed On Screen
2. Printf Inside “If Statement” will print “Hello” and returns Integer(number of Charcaters Printed)
3. Subtract 5 from That number so We will get if(0) which is False Condition.
4. Inside “else” block we are printing “world” .

Way 2 : Output :

#include<stdio.h>
void main()
{
if(!printf("Hello"))
  {
   printf("Hello");
  }
else
  {
   printf("World");
  }
}

Way 3 : Output :

#include<stdio.h>
void main()
{
if((printf("Hello") > 0 ? 0 : 1))
  {
   printf("Hello");
  }
else
  {
   printf("World");
  }
}